The field of fighter replicas is full of half finished aircraft often abandoned by the designer of the kit. I've been around several of the successful replica fighters, and have also been involved with full size warbirds starting in the 1980's.
I also owned and flew a very early homebuilt Pitts S-1C (I did not build it).
I followed a blog by a fellow building a 3/4 Spitfire with a modified Chevy engine in it. He had successfully built and flown a similar plane with a smaller engine. One day there were no posts. He died on the first test flight.
Another aircraft (Thunder Wings fiberglass Spitfire) was damaged on the first attempt at a test flight, and the Norwegian Aviation Authority refused to allow any further attempts.
We have quite a bit of homebuilt activity at my local airport, we have had two fatalities with first "high speed taxi attempts" in the last four years.
I think the first thing you might consider is research of the various replica aircraft available, how many are flying and what kinds.
Get some flight time (if you haven't already) in a Pitts S-2B with the big engine. This will give some idea of what a high powered 3/4 replica will be like on landing, through the handling of the Pitts in the air will probably be better.
These are links to some replica sites. Some these have yet to have a successful flight, some of have quite a number of aircraft flying.
Good luck!
http://www.spitfire47.com/http://www.spitfireaircraftco.com/home.htmlhttp://www.thundermustang.com/http://www.jurcaplanswest.com/http://www.waraircraftreplicas.com/