If you were worried about size comet did some 18" to 20" "warbirds" designs, some of which are scaled up versions of dimes, so have flat sides with shape top and bottom. The always look very light and from what i have seen they fly well, although it is my firm belief that Scigs could make a brick fly. If you haven't seen his builds before, they are variable, but only from fantastic to superb.....
BTW I have the 18" tiger shark kit, and IIRC the plan has no indication of where the rear peg is, so some of the others such as the Hellcat might be the same. So how can a kit scale judge deduct points for a forward peg if it doesn't show where it was in the first place?

Andrew