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See if you can get a copy of the Bosch automotive handbook, think it is version 10.
Suspension wise, I'd chat to either GAZ suspension in Essex or LEDA/HBE engineering norfolk.
Why not look up formula student, some teams build their own chasis, well design and get someone else to assemble the chassis. Design the suspension etc.
If you were in England, say go to Jevington house, near beachy Head to see and speak to the guys rebuilding, restoring the Campbell cars as well as building other vehicles.
I was wondering how I'd finance it 😉
I know what you mean regarding a restomod though, it's probably a bit more sensible for a first big project.
I can't help but feel like once the whole thing is broken down into it's constituent parts though there's no one element that's too daunting aside from the chassis and suspension design but looks like getting a license plate on the finished article in Ireland is going to be a nightmare unless there's a "donor" chassis with a VIN...