Hi Sako
Most of the detail is in the previous script - three pieces (sides and bottom) out of a single 1200*160*25 fence paling
The top needs to be a bit longer to cover at both ends - Trapper Joe in Wisconsin may have made the overhang a bit longer to keep the snow out of the entry hole
The sides sit on top of the bottom piece so you get a good fit for the trap - cut the front end to fit the sides and bottom
Use a bit of 50*40 (or similar) for the top at the viewing end - a solid piece for the screw that pivots the top
Get a packet of 60*2.8 galv flat head nails - as well as some galv coach bolts and large washers for the top pivot
Make some latches out of 2mm soft wire - 100mm long - staple them to the sides of the front and the latch staples in the sides of the top - the latches will hold the top in place and stop it twisting when it dries out
Glue all joints with plenty of PVA glue
Drill the 50mm holes in the front after you have built the boxes and before you attached the top - that way you can put your boot in the box to hold it steady - cause hole saws can jamb
Also drill a 6mm hole in each front corner of the bottom - water needs to drain out of each end - or the untreated wood on the Victor trap might rot if sitting in water too long
Get the timber from somewhere like ITM - tell them what you are doing and ask for perfect pieces from down in the stack - keep them block stacked until you use them
You will need to find some outfit that will cut short lengths of mesh - most sell rolls and won’t cut it - staple the mesh to the timber using a heavy grade stapler
Early on - I put three nails in the bottom to hold an egg - got rid of them and got rid of the stinking bait trays - I now just use a handful of dry grass to sit the egg and ping pong balls on
That’s about it - I still haven’t caught a stoat - just rats and mice - I haven’t seen a stoat or weasel for the last couple of months - but they will make a mistake one day and a Victor will get them