Check out Highline Guitars on YouTube:
Those might serve as blanks for single pickup covers, perhaps?
Japanese Cedar is a very soft, fragrant wood. It may not be the best choice for a Tele top.
Wow, you picked a high difficulty guitar to build for a novice! Might I suggest you try a cheap Chinese LP kit first just to get the idea of what...
I'm not familiar with Mohawk, but have used Stew Mac, Behlen, and ReRanch with excellent results.
Give this site a try:
Sounds like you're best off making your own template.
You could try a tiny amount of filler.
I'd do the latter.
Tough one! Is it yours or a customer's?
Of course you can join them; you may need to strengthen the joint with some dowel pins.
Fret height should not make a difference - how did you check the tuning? Do you have a strobe tuner?
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