Keep construction light and especially in the tail and I bet you will have a really nice plane with that engine. Since it is a light engine for the design, you really want to be careful about weight in the rear. Use a steerable skid if you fly off grass. Tail wheels are just extra weight in the wrong place. Use a razor plane to taper the elevator and rudder, and replace wood in the back if it feels heavy. Don't put the stab on with epoxy get a good fit and use regular wood glue. Substitute lighter pushrods if necessary. I did those things on a BUSA Stingray of very similar size and kept it a little under 4 1/2 lbs and I thought it was really nice on an OS .40FP. Your TT .36 is much more powerful. Consider an 11x4 prop. I'm guessing you aren't looking for blistering speed, and the low pitch/large diameter should give good pull on verticals. Let us know how it comes out. I think you will really like it a lot if you keep it light. Jim