and i am thinking about getting a toy box from marlin crawler. i am going to run the stock axle housing with chromoly insides.
Sounds like you & yer dad have done the research & are *qualified builders

Most importantly, what steering knuckles you gonna run? You know about the stud shearing problem right?

Lets see a closeup of the front & rear frame link mounts. I had to custom make some headers to raise them up & outta the way for my 4 link front due to lack of frame space - I'm runnin an LC big block too