UPDATE 2015-05-15: PDB Base. The two files for the lower (BL_PDB) and upper (BU_PDB) base parts offer the ability to mount a pdb (abusemark or one with integrated step-down-converters) and the FC or even an OSDOGE sandwich-style for some extra neatness. v3 offers a few minor improvements.
UPDATE 2015-07-18: arm V3: minor changes, mainly for 220X motors
The MT220 quadcopter frame is a very small and sturdy frame for a full size 250 setup.
To my knowledge it is the smallest folding H-frame for 5" props.
-220 diagonal motor spacing
-FPV plate for 28mm hole spacing
-FC mount for common flight controllers
-arms folding backwards
-holes for zip ties to secure ESCs, PDB, VTX, Battery alarm, asf.
-slots to secure the battery on top and even on the base if you can manage to fit it into there
-slots to secure mobius and 808 cameras
-3 holes for bobbin vibration dampers to mount a camera platform (to be designed)
-mount for a cased gopro (might look funny)
4 m3x20 screws
12 m3x18 screws
6-8 m3x10 screws
6-8 m3x35mm spacers
8 nylon washers m3
8 metal washers m3
16 m3 locknuts
zip ties, loctite, double sided tape, heat shrink, stuff to mount your fc and camera, etc.
dys 1806 motors
gf 5045 props
sn20a (blheli) escs
sony 600tvl camera
boscam 200mw vtx
arms: 3-4 perimeter layers 70% infill
body: 3-4 perimeter layers 30-50% infill
hardware needed: M3 locknuts and screws in several lengths, M3 35mm spacers, some loctite and quite a few zip-ties.