Just put together a completely custom hexacopter that I designed in AutoCAD. I laser cut it out of plywood. It has had many iterations in design, and I am still working out the kinks, as the arms are rather fragile and break too often.
Here are some specs:
Naze32 FC
Multistar 1704 V2 1900kv Motors
Afro 12A ESC with the latest SimonK flashed.
Gemfan 5045 Props
FrSky V8FR-II Receiver (Probably will exchange for FrSky's smaller 7 channel ACCST receiver, the V8R7-II)
300mm "wheelbase" (distance between props that are furthest from each other)
Can take anywhere from a 3S 1000mAh to 3S 2200mAh, but I use 35C 1000mAh and 25C 1600mAh. The 1000mAh results in around 7 minutes, the 1600mAh results in around 9 minutes. The 1600mAh can deliver a lot more current than the 1000mAh. the 1000mAh frequently makes my voltage alarm go off, while the 1600mAh rarely does so until it is exhausted and ready to land.
I'm really pleased with the results, it flies better than my FPV250 from hobbyking (my first multirotor after the Hubsan X4 that got me into this hobby). It is a tremendous amount of fun to design a multirotor from the bottom up!
If you are interested in seeing more details, you can check my blog out at http://alanhuntrc.blogspot.com/.