Tsarbomba

Imbgoing to pick up some 8-10 oz hide. Want to saddle stitch a few personal holsters and im not sure which size thread and punch to get. I was thinking 4mm punch and .80mm wax poly thread. Although Im not sure what to buy or even the size.

My sole purpose is to start making badge wallet and badge wallets only. For officers in my department and possibly other depts, The genaric wallets dont cut it. Beres what I have so far. Problem is Id like to saddle stich each wallet and not sure on needles and if I should use a groover. This is whatI have so far. Anything else recommented for either cutting, and or stiching?