</font><font color="blue" class="small">( ....On the rear of the axle housing there is a flat spot on each side two ~3/8" tapped holes. I'm thinking this is where the ROPS should/would attach. My first and only weld job is MIG welding a lumber rack for my pick-up.
Has anyone made a ROPS? Any advice? )</font>
Vas,
There are some great responses here, and many concerns about your own safety. We built or own ROP's. I felt it was a well thought out, safe and clean installation from the mounting points to the tabs for a canopy and Simpson lap belt.
When finished (including paint), we mounted the ROP's onto a 6" piece of heavy wall pipe at the base and took it and a weight (18"x24"x24" - 1/4" thick plate, filled with concrete and rebar) to a friends place. Setting the ROP's on his gravel drive way, he used his very large JBL excavator at full horizontal swing speed and hit the ROP's from one side and then the same on the other side. Each time, using a tractor to push it back into position. The weight (approx 600+ lbs.), loaded into the excavators bucket, was dropped from about 8' onto the top of the ROP's.
When we brought it back (the damage looked significant) and stood it up on our original template, the vertical supports spread the base 4" (1 1/2" on one side and 2 1/2" on the other), and the right side vertical support bent almost 3" out of center. With the impact scars and the appearance as though someone rolled it off a mountain, it faired quite well.
We built another, identical one and installed it on a Yanmar. I used the tractor for three months, removed the ROP's and seat belts and sold the tractor. BECAUSE of the liability issues, it was not worth including the ROP's in any sale. Someone, somewhere may injure or kill themselves and I would be responsible. That little ISO or federal certification shoulders all the liability issues along with the manufacturers costs at resale.
Sorry, I have no pictures that were backed up and lost everything in a hard drive crash last year.