Next weekend, given a little time on Sunday, I will take photos of the DRO installation on my 8520 and do a quick writeup on the project. It took me the better part of an afternoon and an evening to do it all, but it wasn't all that bad. The hardest one was for the Z axis as I had to figure out just how much to space the upper end of the scale in relation to the bottom end, due to the fact that the column is not straight.
I have some muzzleloading classes to teach on Friday and Saturday, leaving only Sunday, which might leave me a little short on time. If worst comes to worst I will get them posted on the following weekend - nothing planned for that one - so far. If you have any questions about installing yours, feel free to ask!