here is a link to my build thread
[link]http://www.rcgroups.com/forums/showthread.php?t=669348&highlight=bobcat+50[/link]http://www.rcgroups.com/forums/showthread.php?t=669348&highlight=bobcat+50

all the info is here , you can se how much I removed from the rear section, even between the wings is 1/32 ply that is concave to match the fan. The goal was to get the fan lower with cleaner air. I have done a lot of scratch built EDF so I have some experience with this.

The plane is nice for the money but it could be so much better, the airfoil is way too thick for one and some of the parts are way too heavy (each boom weighs 10 oz) I sure I could replace them at 5 oz each saving 10 oz total

still it is a bargain at the price and we can all experiment with them
I will post a flight report and video soon