There was sort of a "kit" Me-109 on epay a few weeks ago...all the parts needed to assemble one airplane. Don't remember what it sold for though?
The Chipmunk didn't fly exactly the same as my Me-109, mainly because my buddy wasn't as experienced a pilot, so he didn't have his modified like mine was. The first few flights, before the mods IIRC were pretty much the same though. Jeez..I'm diggin' for that one...it was a long time ago probably 1975?

I did some of the mods to mine as per an article in one of the mags of that time...I think it was Flying Models? I think it was Larry Renger (sp?) who I believe worked for Cox at that time, and knew how to wring quite a bit more perf. out of the airplane.
I remember putting a piece of 1/4" sq. balsa behind the leading edge to stiffen the wings, and make them more ding resistant, because we occaisonally flew out of his back yard where there were tall weeds/sticks sticking up and we'd thwack into 'em once in a while.
I bent the gear back a little bit for smoother T.O. and opened up the bellcrank area for more deflection...
I'm forgetting a few, I know...maybe I'll remember 'em later?