No doubt there is a lot of information already on the site with helpful tips but to search it out is very difficult and time consuming.
That's what it takes to do a scratchbuilt!
For every hour that I spend actually working on the car, I would spend two hours searching out info applicable to me. I have two Eastlight folders of information that I have printed out which probably represents maybe 1% of all the stuff I look at. All the information is out there on this site and others and in books.
If you don't have the determination and ability to search out the info, you will be lacking the determination and stamina to finish it.
There are two main reasons most people do a scratchbuilt. Firstly cost, one can start with a few hundred bucks worth of steel tube and maybe a grands worth of resin and matt and use your sweat equity to produce your chassis and body. Secondly you get to build a car to the exact specification that you require, you don't have to accept the manufacturers design/execution compromises that come with every kit. You will have to make compromises with your build but they will be compromises that suit your situation, not somebody elses.
Every scratchbuilt is different and I'm sure if someone wanted to do a 'LoCost 40' they could. But low cost and GT40 don't belong in the same sentence. I doubt very much whether one could build a reasonable representation of a GT40 (by that I mean SBF and transaxle not some adapted fwd) for much under $30k.
Also once you start building, you tend to upgrade your original ideas. The cost of my car has now escalated to about $50k because I decided to upgrade to a 500hp all forged 351 with good heads, roller everything and drysump. Plus a few other niceties like Koni double adjustables etc, etc. When I first posted on this forum I was asking questions about how strong the standard 351 rotating assy was, as I was going to run a slightly warmed over $1000 junkyard motor!
Over time the goal post move!
The idea of a seperate 'LoCost 40' info thread is good, but like everything someone would have to do it. Dave?