Yes. Nothing wrong with thinking on it a few days. Welding a plate on the top rail will secure it. By the looks of your top rail its intact and solid at this point.
Could rebuild the sides get those secure again then cut the old sides off. I mostly do one side at a time. So to make sure the frame stays at the same point. Not a good idea to chop both sides completely off as bending can occur.
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7 3rd gens listed in the build thread (2 are parts mobiles)
Build Thread:
https://www.toyota-4runner.org/3rd-g...os-builds.html
Brillo's Bucket Fluid Ex changer:
https://www.toyota-4runner.org/3rd-g...ml#post3358086
Sparks Plugs Wire and Coil Information:
https://www.toyota-4runner.org/3rd-g...on-5vz-fe.html