I decided to build a "Bushkill Bee Vac" used to help removal of bee hive cutouts from buildings and swarm removal. If you are interested the design of the box and operation is detailed at beesource dot com if you go the their forums and search for Bushkill Bee Vac and follow the sticky "Building the Bushkill Bee Vac".
I decided I could make this bee vac a little more versatile if I could use standard hole saw to make one hole with inserts for multiple shop vac ports in the top of this bee vac. This bee vac can use a 1 1/4 vacuum hose from my small shop vac or a 2 1/4 shop vac hose for my large shop vac. My goal was to use the quietest shop vac and still have enough vacuum to pull the bees gently through the bottom hose into the hive. One could simply cut multiple holes for the different size shop vacs but I decided to have one hole that adapts to different shop vacs. The printed parts are green PETG since it makes decent threads for the port and the screw in plugs. The green top ports are for the vacuum source(s) but there is another hole with a plywood square to adjust the working vacuum the inside the bee vac. The hole on the bottom with the sliding door is sized for a pool vacuum hose that in my case is 25 feet long (YMMV) allowing the bee vac to be away from one's ears when vacuuming honeybees. As the bees are vacuumed they go into the bottom of the vac then into the middle box (an 8 frame deep Langstroth hive body) where they will live after the rescue is finished less the top and bottom of the bee vac. When the bottom hose is disconnected the slide is closed to keep the bees inside. The bees cannot get out the top holes due to a #8 size piece of hardware cloth under the top slideout. The slideout is removed during transportation to keep the bees from overheating.