Building from plan
Goinstraightup
I buy my wood from either Balsa USA or Lone Star and like I said build only (almost) from plans, so I buy my wood in bulk. I bundle all wood via size and and keep track of the price per sheet. MY orders are usually $150- $300 and that builds about five years worth of planes.
I noticed I your estimate of cost that you included items that are not included in any kits that I have built (Wheels, tank, fuel lines, engine mounts ((I will not use those fiber fill plastic mounts)) etc.). If I included that in my estimate my cost would go up but if I kit built I would still have to buy them also.
The order of wood that I built my Bingo from built a 4-60 (a shoulder winged Bingo) two Bingos and a Goldberg Cub that I built from plans of one that I had built and sold, and a Taurus(Kazmirski's design from the 60s) and I still had a lot of wood left over.
The Bingos were the original Bingo .60 sized I used a O.S. 91 Surpass and the 4-60 uses the same wing but shoulder mounted.