Looks awesome! Contemplating a similar setup myself.

I cut the end off a cotton swab and use the tip to put epoxy in the holes and coat the upper threads of inserts.

Hence a recipe for fucking you up - perhaps screw in the heel and use the pins after you settle into the binding. Just don't fall?

I should do that on gaper day for shits and giggles. DIN toe block, Tech heel block on one side, visa versa on the other. Sounds like a recipe for getting fucked up.. haha