Nice reply, and your excitment is fully understood!
I would venture to say there are quite a few guys who have designed and built KBHFs that will fly just fine, sorry but on my part don`t own either a go pro or vid camera so no action shots.
I will also say that I have tested D I Ys that were not strong enough and broke, myself and close friends included, and ones that were just not well thought out and poorly fabricated.
I downloaded your DIY KBHF photo to rotate it and zoom to have a better look.
I would make sure the your fuse between the T E of the F wing and the L E of the strut is strong, loads of stress there.
If you build another consider mounting the F wing under the fuse closer to the strut.
Your nose looks like it could use some cosmetic surgery.
If you can find a windsurf fin use it a a reference for all L E and T E sharpness, roundness.
Do you know someone who knows how to fly a KBHF so they can test yours?
A few photos
1st, way to much build time in early 2009 was not built well enough to fly, to much strut twist, and board to narrow.
2008 FOIL.JPG [ 76.85 KIB | Viewed 456 times ]
My second build in 2010, very cara, air chair copy, wood strut core carbon wrapped, double wall alu fuse,1st gen wings 19 layers 300g F glass F, 4mm aircraft alu R
I am proud of that as it was the first flying where I live and MANY learned on it as well as still flying just slow and easy to this day.
P1060214(3).JPG [ 3.86 MIB | Viewed 456 times ]
3rd with prefab 1.1mm carbon plate built for high wind, low A R F wing. strut 13mm thick
R wing screws drilled thru to test TT fins, have since added inserts.
P6160008.JPG [ 508.86 KIB | Viewed 456 times ]
4th same carbon plate but cylindral fuse and higher A R quad aixis carbon wings, strut 1.1mm
P1010029.JPG [ 485.26 KIB | Viewed 456 times ]
I submit these for you in reply to your kind last post and to say that yes one can and have designed and built good flying KBHFs having invested a lot of time.
I would think that now if you asked any questions here you will get kind replys.
May I suggest use this to learn, front foot hook.
P1010005.JPG [ 490.74 KIB | Viewed 456 times ]