Welcome Mike,
How much shop space, tooling, and experience to you have? What else have you made? What's your time-frame and budget?
The answers to those questions will help the gurus direct your efforts
more accurately. Not everybody needs to be told how to drill a hole, but many do.
I, still a novice at gun making but a "handy" sort, took the advice to use a blank and am glad i did so (I had help with the RR hole and initial layout, and overall shape). First it provides square (after planing) surfaces for references and a stable platform for drillings. Second you have much more wiggle room to suit your ideas of fitment and maybe some error corrections. Third-loads of scrap for working out your finish on before you start on your actual stock.
The other end of the spectrum is a "in the white" gun with all fitting done, but you do all the finishing. That's the fastest way to get to shooting and you might still spend a great deal of time (or not) finishing it.
Metric craptonne of info here. Great that you've narrowed your desire to a specific maker. Learn well, the teachins is here.
Also, I'll stand right up and recommend
The Gunsmith of Grenville County, Peter Alexander (Revised), that and if TOW (or anybody) sells a full-sized plan of your style-get it.
Now go wash your mouth out for mentioning that other thing on here...
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hey if these guys say that style is "ambitious" then you've been warned! also, that you've "assembled a kit" and aren't shooting it raises a flag. Tell us why you don't dearly love the T/C 45 that you mentioned?
now seriously, find some good tastin' soap...