Iwould second Chucks' plan. Personally, Iwould go with the 60 size because the parts are larger and easier to manipulate. You could have either one of them framed up in 2 weeks, with no prior experience. This would give you the opportunity to see way the pieces are cut, and the materials they use to make them with, the quality and consistancy of the wood, etc. Ihave the LT-40, and it is a great starting tool. Good luck!

Build thread on the LT-40

http://www.rcuniverse.com/forum/m_3439708/tm.htm