man, i am the same way. i spend all my free-time trying to figure out what i could improve and what needs improving, i cant stop thinking about my yak on order, nor about my little home made 4 rotor thingamabob or thinking what should be replaced and thinking of better ways of doing it. it's called rc fever, and it never goes away. it's the worst when you have so much you want to do and no money to put into it (me) because you just cant stop thinking about how to make the money and all the wierd things you could do to your plane with it. i am sure if i had all the money in the world i would eventually get bored with it and move on to other hobbies. it's the lack of funds that keep the flames going.