RE: SIG LT-40 ARF
I built mine from the kit pretty much stock. Use rubber bands for the wing, trike gear and TT 46 Pro for power. With an 11x5 prop it has plenty of thrust - can bail you out of trouble quickly.
I found it to be a nearly ideal trainer - easy to build, very easy to fly and durable. Only weak point is perhaps the vertical fin mounting (ours isn't reinforced but not a problem so far) and kinda flimsy LG. Unless you grease it in on the landing (very easy to do BTW) you risk a prop strike on the runway.
Ours has around 40 flights so far and still lookin' good.
[link=http://www.rcuniverse.com/forum/m_3477988/tm.htm]Our solo Thread[/link]