Try this, I'm building one today using this...
https://www.icmag.com/ic/showthread.php?p=4206430#post4206430
hey! that is exactly how i grew my largest plant to date, a little over 22 oz's. i think the pics are here in this thread somewhere.
stock tire valves with no drilling, 3/16" Inside Diameter black latex tubing, and the standard .170 id/.250 od drip line from lowes.
same line for pulse with a tee on the end for a terminal.
but don't plumb it like that diagram.
instead get a bigger container for a reservoir, put a float valve container and float valve inside of it like i did here and plumb the returns back to the pump chamber/res.
and build the manifold shorter trying to keep both it and the pump submerged.