I fixed my internet issue and am back.
The ram is Chinese, all I could find that would not break the bank. I don't know much about hydraulics but the 2-1/4"-14 tpi thread on the tube looked ideal for mounting. The thread on the ram is 1-1/4" NPT and I have a forged coupling that I will work into an adapter.
I used the lathe face plate to hold for boring and cutting the threads for mounting the ram:
The mounting plate is 1/2" thick A36 and I got a very snug thread engagement.
I ran the thread strip numbers on the ram mounting threads as follows:
A36 has an approximate shear value of (36,000 psi)(0.58) = 21 Ksi.
So the safety factor at full load should be around (21 Ksi)(1.9 sqin) / (10 ton)(2000 lb/ton) = 2.0
Here is a side view. I used grade 8 bolts and avoided welding all but the base support.

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