The side would be easy enough to cut flat patches for, and weld up. The hole along the bottom of the frame would be tricky to patch, as you'd have to custom bend the patch plate to match the frame bend. Could you find a front/side wrecked YJ in a scrap yard and take the rear of the frame off? Looks like the last ~12" of both frame rails and the cross member from a donor Jeep would take care of your trouble; wouldn't be too complicated to cut and weld it in.
^ agreed just fixed my pass side it wasn't bad but looked a whole lot worse then yours lol i just welded on the side peaces then cut the bottom then welded the top section and beat it into shape with a sledge and used a c clamp to get it really snug with the rest of the frame and just welded it as i went clamping about 3 inch at a time. also will they pass you for an inspection sticker with this done? i grinded all my welds down REALLY well used some bondo to smoother the rest out and under coated to make it where you couldnt tell at all. the only place you can see i did it was around the shackle where i didnt get it welded up really good ill post pics later
I looked at those pieces. My only problem is my only good access to a welder and the tools goes back north. My friend is in college and is only home ever couple of weekends and he is usually busy in his fields farmin. I don't think they require an inspection here in Ohio.
What about where the shackle bolt goes?
"Shiny side up, Greasy side down"
Me, I'd just look for a good fame and put the body on it, that's if the body don't have rust if it does go down south and buy a good jeep and keep the best of both a sell the left over parts and scrap that POS. good luck
If it doesn't have to be pretty, and you have more time than funds... Grind out the rusty spots, and cut/grind similarly shaped patches out of 1/4" plate. Then visit a buddy with a welder, or try to rent one from somewhere to burn the patches in.
I used the Auto Rust Technician parts to replace driver and passanger rear sections and also rear cross piece. I originally was only replacing driver side but the further I got into it the more cancer I saw! Remember on these frame the Bad rust starts on the inside (of the frame) and rusts to the outside! You are likely to find more rust as you get into it! In the end I am very satisfied with the parts I got thru Quadratec.