[OBeer-WAN-Kenobi]

Welcome! I wonder if rules and regulations might be more of a problem in Ireland as far as doing an engine swap? I'd definitely check that first.

What engine are you thinking about swapping in?

Like Vince said, there is no real need to do anything with changing the body or wheel base or anything. You can buy upgrades that pretty much bolt in for suspension, subframe, brakes and the rear axle if necessary.