Sheet metal shed for housing air compressor and a generator, any advices for ventilation and insulation

You'll need to orient and plumb the propane cylinders so that the water condensate can be drained.
I'll need to modify the tanks to add a drain and threaded inlet / outlet, feet but that is for the future, first need to adapt the space.
 
I'll need to modify the tanks to add a drain and threaded inlet / outlet, feet but that is for the future, first need to adapt the space.

SAFETY ALERT: I don't know your personal level of aptitude, education or experience so, please don't be offended if the following is obvious to you. I need to add it here for the benefit of the uninitiated. Your propane cylinders once contained a fluid capable of exploding if an explosive fuel/air ratio is exposed to a source of ignition. No matter how well you purge or rinse them out, please do not weld or grind on the cylinders until you research and follow safe procedures.
 
Without going into theories of sound reduction and ventilation might I suggest having a look at foamed concrete? An alternative is Polystyrene lightweight concrete. The foamed concrete is better in many respects as it can be easily cast,(Polystyrene concrete needs to be under pressure as it sets), it is fireproof and has outstanding sound insulation properties, its density can be controlled for different applications and best of all is easy to do at home.
http://pelagic.wavyhill.xsmail.com/cellcrete_how.html will give an idea about what it is. HoneyDoCarpenter has another simple build and his experimant with shampoo as a foaming agent is a good one.
 
I don't know your personal level of aptitude, education or experience so, please don't be offended

No offence, i should mention i know the risks of cutting on fuel vessels, and the cylinders will be prepared properly when the time comes.
NortonDommi, DIY foamed concrete and polystyrene is a good idea but i simply don't have the time to make them from scratch. A Friend who is a contractor suggested glass wool or stone wool first then polystyrene, but that doubles the price.
 
GoceKU, Sorry I wasn't aware of the time issue. My shed is tin but I've lined the walls with surplus,(as in free for the taking), MDF. As my compressor has been living back in with me due to removing old shed at back for a new one noise is noticeable outside so I only run during the day.
If I were a rich man, deedle diedel deedle diedle dum... Many things I would do if I only had money!

What is flexible sheeting worth? Something like that rubberized bitumen sheeting that gets used on roofs.
Having some mass and being flexible it would probably attenuate sound.
What I had was a concrete block box with sand filling the blocks an angle iron reinforced ply lid with capping blocks on it inside an old shed that was partially open with air in through a buried drum intake and a couple of old microwave oven fans blowing out side vents. Compressor intake was through about three feet of 4" ducting with a cooking range vent filter on the end. It was pretty quiet. I live in an urban area and had no complaints.
I have upgraded the compressor,(an old Ingersol-Rand type 30), to a larger 3-cyl. unit so need to do a rebuild hence new shed.
 
Norton Dommie, a year ago i had a lot of time to spare, but i switched jobs and now i'm close to 70 work hours in my full time job a week, plus i have two part time jobs in between and the weekends, so very little time free. I'll see about the bitumen sheeting, that may be a good extra layer for the sides. Other thing i did not released is how much scrap and firewood i have in there, i may need to build me a trailer to get rid of it.
 
I've spent every free minute last few weeks in clearing the sheds, i had to hire truck to move all the scrap and made multiple trips to the dump. Surprisingly the north side sheet metal had completely rusted out, so i removed it and the front side also was bad, couple kicks all fall down, so after few trips they vent to the dump, now i have a shed with only two sides and roof, i've bought couple square tubing and galvanised sheet metals for added bracing and making shelves on all sides. I'm also looking in to insolation and looking at sorting some sort of LED lighting.
 
Little progress update, I've worked on and off on the sheds in my freetime, i added more supports with square tubing, also made a door frame and attached it. Last week i did manage to rivet on the northside sheet metal, which was small side but difficult because of tight space and steep terrain, i also managed to install LED lighting strips in both sheds i'll snap some pictures next time i'm working there.
 
Last few days i've been working on the lower side of my property, where my shades are located, i've never managed the rain waters here. The big shed could flood and did flood when bigger storms come so i decided to remedy this before i install the new sheet metal and put it to use. I have drainage pipes in the ground but they are deep, so i had to dig by hand day and a half to get to them. Then i bought PVC pipes and fittings and plumed everything to drain as it should, you can see the feardes drain is in the middle of the lower side of my shed, i also installed one more to collect the water from the sidewalk also connected the storm drain from the roof. This was an unexpected work but i know i had to be done right sometime.
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doing it right will pay off in the long run.
 
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