Mods I would make to the Dominator would be:
1/8" carbon fiber push rods from
www.darrolcady.com
Heavy Duty Aileron Torque rods (I believe sold by Dubro)
I wouldn't use carbon Fabric under the skins, but I would use at least a 1" strip (top and bottom) of .007 carbon laminate on the highpoint of the wing.
I believe the firewall is 1/4" thick. I would glue a 1/8" piece of aircraft ply on the front of the existing firewall tying the fuse sides and the firewall together.
Make a slurry of chopped carbon and epoxy and fillet the inside joints of the nose around the firewall (carefull of the blind nuts).
Personally, I would stick with the Conventional tail. Easier to build and you won't give up any noticeable speed.
I would glass the plane with 3/4oz glass and paint, as opposed to plastic covering.
Its been a few years since I built one, but if you have any specific questions let us know and I'm sure we can help you out.