Well we build unit #1. Definitely overkill which is typically my style. Drilled holes about every clock position skipping the 4 thru 8 or so. Holes every 4-5" and staggered rows. Added a couple of large holes for side entry. I also wove the ends to try to prevent larger fish from entering.
The end tubes cross over and some press into holes to maintain position. The main body hose the tubes just stick in.
