Making a pete sleeper into a unibilt

I’m trying to do the same thing to my truck I have no clue where to start tho from reading here I’ve gained some info but still need some more knowledge from you guys to get it done

 

If its answers you seek first you must ask the question

 

How did your 359 project turn out? My 359 has a 36” bunk. I put 2 pieces of aluminum tubing from the rear of the bunk to the front of the cab and attached it various places to the cab/sleeper crossmembers then I mounted an air ride kit at the back of the sleeper. So I somewhat have a Unibilt design but still have the small hole. I’m 6’ 3” so would like to make a larger hole so I can move my seat back farther!! My question is, Does someone know if I can mount the modern Unibilt brackets onto my cab or do I need to add extra pieces internal structurally. (My aluminum tubing has been in for 7 years now but they are bending slightly.)

 

Just came across this. I have my unibilt rings installed on my 1990 379, trying to figure out how to relocate my seat belt brackets. Do I need new ones or can I reuse my old ones and if so where is the best place to put them?