3100 frame lengthened to 3600 specs. Anybody done it??

[Coach529]

Casually shopping for a 3600 chassis for Henry. I would like to build it up with IFS and IRS on bags and once I get it all built do a body swap.

I have not been looking very hard, but have not come up with anything local.

Then I got to thinking. I have a 3100 parts truck. There is not much left of it. Missing doors, body work is rough........etc. But the chassis is there.

So could shorten my box, but I would much rather stay with a long box. Or lengthen the 3100 frame 9-1/4".

Has anybody done this?