no issues when i flew it. this was a customer build and i have not heard of any problems since. hopefully its all ok

Just figured out it's fine. Other esc's has that contact too.
Anyway, nice quad and video!

You can turn it upside down, just need too switch sides the cam guard.
Not really usefull though because, in "normal" configuration, the frame is so low that you have props at the same level than the top plate and like so a 50/50 top/bottom weight distribution.

So it should fly optimaly in the "normal" configuration already? What changes in the fight characteristics are there?

Personaly, i like it better in "normal". It's damn well balance and kind of "buttery", definitely for smooth freestyle.
For freestyle you want to have an even mass distribution on all axes and as close as possible to the center of the X.
Left/right and front/rear balance is quite easy but for top/bottom it's trickier since the middle referal is not the X of your frame, rather your "prop line".
If you build it "reverse", you'll have your prop line at the middle of your battery pack and so, more weight under than above=not good.
This is theory by the way, if you look at Ummagawd's Remix it has the same issue that i just described but seems to work well eitherway.

Thanks

Midmount is definitley smoother and more flowy in my experience. If you like doing a lot of looping and diving it definitley has an easier time, the top mount even at 10 or 15mm stabilizes itself a little easier so if you like to cruise along the ground a lot it has an easier time doing that. Very locked in. I prefer the CG in a top mount build, and then the Vert Freestyle for a midmount.