Hi again Mike...
You're right about the effort and $ comment Re: Warbirds, but thats why we do it, right? It IS worth it in the end.
Originally i was going to kit-bash the ARC to correct some of the bigger scale issues and quickly lost sight of the base I was going to work with, and have now decided to go the kit route to fix things along the way. I read a few threads of others that are building and kit bashing to discover there is little point trying to mould the TF into a scale competitor.
Still, its very hard to resist altering a little here and there and getting lost in the soup

Again, thats why we do it.
As far as a powerplant is concerned, everyone has an opinion about this. I ran a poll in the warbird section for this model with interesting results. We all want enough power (some more than others) and to be able to hide it all in the cowl. Not an easy task on this model. I am personally leaning towards the likes of a DA-50, but I'm still investigating the Revolution 50 (including shroud and fan) and the availability of the ZDZ50NG... both of which are gas and should fit with no cowl cutting.
I'm interested to see which route you take and your decisions along the way...
Good luck!
Goose