Well, I have the Venus done, and the .91 four stroke fits like a charm! I had to scratch my head a bit to get the throttle linkage to line up right, but other than that it looks awesome. I moved the battery/reciever behind the servos (instead of in front like the manual states) and it balances 1/4" BEHIND where the manual suggests to start. If I had put a light 2 stroke on it (and put the battery/reciever in suggested position), it looks it would've taken some nose weight to get it to balance properly. Anyway, it will maiden at latest this sunday. I'll give a flight report ASAP. And I'll post some pics (just for good measure) sometime before then