Update:
So, I have some good and bad news. Starting with the bad news, I've learned a few things that make this project a bit of a stretch to call it a simple DIY, but I'm persevering.
First and foremost: The Tilton MC doesn't sit right with any of the bolts. This was a major pain which I decided drilling two holes into the firewall was a bad idea. So, unfortunately, but not the end of the world - I created a custom prototype adapter bracket to mate the Tilton MC to the OEM bolt holes:
It's a rough prototype, but it works! The MC sits nicely inside the car and smoothly against the firewall. I didn't show a few more pictures, but I trimmed it down even more and shaped it properly. The plate is a quarter inch thick, so I've added a total of .25 inches more to the total length, but since I see how much room I have with the ABS module, I can afford to do so.
There is also a second issue: sourcing all the proper line and fittings. Turns out it's a nightmare to mate a metric Japanese car to an American master cylinder. However, I am sourcing these special fittings at various stores and whatnot.
This has led me to a point where I thought about something...would anyone be interested in me putting together "kits" where they include the bracket, master cylinder, all line and fittings, to make this a near bolt-on kit? All you would have to do is trim your own ABS module, and have it bled. It's food for thought. I'll also include pre-bent line to mate to the stock line! Also, this is considering that everything on this project works perfectly for my car, and it's solid and reliable.
Either way, the fittings I ordered for my prototype are going to arrive in a few days, so we'll see how it goes from there! It should pretty much be done from there.