Sorry for the delay in the question aimed at me.
I built mine 'sort of' from plans. Basically, it's a proper sized hole saw for the top of the container/tote and then a PVC manifold connected to the pump.
For the manifold, HD/Lowes has right angle connectors and PVC. I have a PVC cutter, but, frankly PVC is soft - I could have used a hacksaw.
I bought the pump and mister heads along with the inserts and baskets from Amazon.
I'm from the measure once, cut three or four times school (mechanically completely incompetent), but even I was able to do this in an hour or so. Depending on what tote you buy, you may need double sided insulation tape to seal the lid to prevent leaks. I used plastic sheeting and duct tape to form a 'shower curtain' around the areas which were leaking/spraying out.
Space efficiency is something my design lacks (really big tote) but it's better than the smaller designs since the pump is the most expensive item and I get more cuttings in my cloner than using smaller designs (like the tote with squares built into the lid).
If I had hundreds of easy cuttings to start I'd use Root Riot cubes in 72 cell trays with a dome.
For the couple dozen I start each season I like the results I got this year from the cloner.
Do a search for my username and you should see my pictures.
Andrew