No, but I will give you some tips on differences in minnow traps and how they affect what you catch.
I have three different kinds.
One is a white plastic trap that likely came from Wal-mart but don't remember for sure. It has square shaped mesh holes and the entrance hole is pretty small with some tabs that can be cut out to make the hole bigger. It catches adult FHM pretty well and the smaller hole is pretty good about keeping small BG out. I have had very little luck with this trap trapping bullheads and GSF in my old pond so no longer use it for that purpose. Half grown FHM will swim right out the square mesh so it traps only the larger minnows. So this trap has a fairly narrow range of fish size it traps.
The second type I have is black wire expanded metal mesh. It catches minnows better but will also pick up quite a few small BG, so if all I want is minnows I have to watch out for the BG in the mix. If I hear a loud pattering sound as it comes out of the water I know I have BG in there. I also use this trap for trapping GSF and bullheads out of my old pond and it works well for this purpose. I regularly catch these slender fish 4" and even a little bigger sometimes. Lots of 3". This trap is probably my best all around trap.
So when I went to buy 3 more traps so I could hit the GSF and bullheads hard this fall in my old pond, I thought I was buying the same trap as the black expanded metal one above. Only these looked a little better because they had wire welded at the inlet hole instead of just the bare expanded metal. (Pics below of the two different expanded metal traps). I first noticed the difference when I dropped the feed in the inlet hole like I always do. The floating pellet feed mostly ran right out the wire mesh, because the mesh is just ever so slightly larger openings. For these traps when I use fish feed pellets for bait, I put some pellets wrapped up in a 6" square piece of brown paper bag material in a wad. The paper holds the pellets in the trap till it gets in the water. I have not used this trap for minnows yet but I am going to guess because of the mesh size it is going to work like the above metal trap except it will let the small minnows out the mesh. I can trap loads of half grown FHM with the above trap to move to other waters, but I will bet these traps will not work for that purpose and will let the small minnows move on through the trap. This trap does work very well on the GSF and bullheads and I assume it will also catch BG like the above trap.
More than you ever wanted to know. My purpose of posting this for you, is to emphasize how tiny, seemingly insignificant differences, in the size and/or shape of the mesh the traps are made of affect what fish are caught. If I want to catch only adult FHM the white plastic trap is my best bet, although it likely will catch fewer fish than the middle trap above. If I want half grown FHM as well as other fish I go to the middle trap above. Ive had it a third full of half grown FHM from my forage pond trappings. Just that tiny difference in opening size makes the middle trap catch the smaller minnows where the other two traps let them pass through. The bottom trap above should catch larger minnows as well as GSF, bullheads and BG equal to the middle trap.
Hope this helps in your quest of building a trap. The middle trap above is the one on the left in the pictures. The bottom trap being the one on the right.
If I were going to build a bigger one, would probably use hardware cloth and make the trap in a square shape like my larger fish trap is. But have never built a fish trap yet. Two or three of these smaller traps might be a better bet, depending on your needs. Just remember, the size of the mesh makes a difference. If you want to let the smaller ones go, use a slightly larger mesh. If you want to catch smaller fish only, make the opening size appropriate. The opening size and the mesh size are the two keys, in my opinion. Playing with these two things determines the range size of fish you catch.
P.S. They also make a crayfish trap that is identical to the third trap above except the inlet opening is larger.
Edit: I have started using large dog food pellets as bait in my minnow traps. It seems to attract just as well as the fish food and the pellets are small enough to go right into the end hole but big enough to not fall out the mesh of the trap. I imagine the LMB pellets would work great too, but I don't have any of those and the dog food is readily available in small bags and pretty cheap.
Description: Smaller mesh on left
Description: small mesh left, right has wire welded in opening
Description: closer pic of mesh size
Description: smaller mesh catching half grown FHM