Building a DI Box from scratch

Today I started building a DI Box from the ground up, as I wait for some parts to complete my summing mixer.
Some people build their own DI boxes because it's not very difficult. You can buy a Jensen transformer for $100 or a Cinemag for as little as $50. Then 2 1/4" jacks, an XLR jack and a chassis. That's it. I took it a huge step beyond average. I built my own transformer from scratch today. I spent a lot of time researching how to build the DI Transformer properly and have been studying my transformer theory. It took me most of the day, but I built the transformer from the ground up today. This is my 3rd tranny build so far, and its def the best to date. I'll post some pictures of the assembly soon, but here's today's pics of the tranny build.







the primary coil is 480 turns and the secondary is 40 turns with a center tap differential ground. Iron core, 12-1 windings.