When i was building a cyl mount for my old 60, i didnt do any welding to the cast section. Lots of guys do it and it seems to work but it made me nervous, i had a 3/8 thick great lakes diff cover with counter sunk bolts and i tied into that for support on one end of my cylinder mount, i dont think you want a truss for strength, you just want to mount and protect your cylinder. That alone will give the housing and tubes more strength, plus most any over the top truss design will hamper you uptravel, and it looks like you need all you can get. One thing about mounting to the diff cover, dont finish welding until your gears are set!!! I had some people ask me what i would do if i had to open the cover, since there is NOTHING i can fix inside a diff cover on the trail i didnt see any point in being able to open my diff without a plasma.