i am in the middle of doing such a conversion now,been going now for a few years and if you have the cash i would sugest you buy a car or shell thats had most of the work done to it.
i have spent lots of money on a nice shell and lots of fabrication parts and its been hard sorting all that out,probably of been easier to buy one done but it would of cost me a fortune for the same type of shell.
here is a link to it, have a look at whats been done and the parts needed,ok, you don't have to go as far as me but you will get the idea lol.
https://passionford.com/forum/restor...elling-up.html