If you think you may be interested in building an ERA from basic kit - unpainted, unbonded, etc. - here is my build thread for some reading. It's back about 2 or 3 pages on this Forum
Progress on #782
There is a lot of extraneous banter throughout the thread and some melodrama but I think it does a fair job of documenting the journey.
There is a lot of info on ERA's website to study. They do not piecemeal kits such as in buy a frame now and a body later, but there are options such as if you want to find your own Jag rear suspension and rebuild/modify it yourself.