From a little wood stock i had lying around.
I need some ideas for a trigger and mounting

I have a parker 3 way valve (on its way), and the 3000psi scuba bottle
(in photo,) to fit as well.... I also have a couple of your standard compressor
type blow guns/tire inflator triggers as well, but i couldn't see a way of
using them, unless i chop the stock down to near where the qev ends?
It would be nice if i could keep the stock for the looks, but the scuba bottle
used as the stock could be an option.
Im making 2 semi autos currently. So if i swap triggers between them etc,
because one fits the other better or whatever, its okay... cheers.