RE: Lanier's Dominator
The Dominator is a good flying plane. I built and raced one nearly 10 years ago and it was competitive with the planes of its day.
I built it with a conventional tail, unless you are at the top level of competitive racing, you won't notice the difference in speed. If you have never built a v-tail, the first couple can be a bit of a chore getting lined up properly. Its a no brainer to get a horizontal stab perfect.
If you are building for sport, you may want to slightly increase the size of the ailerons, and definately reinforce the firewall. After you get the stock firewall in place and pinned to sides, add a 1/8" aircraft ply plate to the front of the stock firewall and reinforce inside corners with tri stock.