Good luck on your project! I hope it really comes out real well.
I have given considerable thought to a T-Bucket. I made one back in '82. I am kinda stuck in the '80's and back then with big hair heavy metal, and big blocks, I stuffed a blown, bored, 460 with a C-6 into a T-bucket. Named it Brain Damage. It lived up to its name.
If it were me today, I would go with a metal CJ2-A Jeep body, small block, 9" rear, Th350. My reasons for the Jeep body, sometimes it rains, gets cold, and I like to be able to lock things up.
My vision would be the body, neked from the firewall up to the grill. A full roll cage, fold down windshield. The body comes with fender well in the rear. In most states, I have to run fenders, so blended flairs would do the trick.
Kinda of non-sequetor to your pursuit of a T-bucket frame schedule but I am hoping someone might have a schedule for a Jeep to finish my project.
I got my plans for the T-bucket from popular mechanics. In the back, someone was offering drawings/schematics for a frame. It was really basic, and strong. I used .025 4135 chromemoly for the frame. They are pretty basic and can be made real strong. The 460 twisted the frame with mild running and I learned a lot from it. I had to angle the body and engine to make it fit and had to add 11' to overall length. It was really too light to be roadable.
It was live and learn.
Good luck. Indeed. I hope you have great success. They are fun to drive.