You certainly set up a major project for yourself. I hope you proceed with it, because it could have great potential. For what they are worth (or if they help at all), here are my opinions or suggestions:
First thing for a "beginner" HotRodder? Make sure they understand how and why a vehicle works. Automotive Engineers aren't sitting around their offices all day throwing darts at a board full of potential ideas to see what they will "try" today. Vehicles, chassis, drivetrains, etc are all well-thought, well-planned ideas. Everything works in connection with everything else. Making performance modifications should be just as carefully planned and thought out.
Next, most of us "common" folk don't have a bottomless bank account to access at will. We all seem to have budgets, and limited budgets at that. Perhaps defining "marketing" would help the beginner avoid being sucked into buying something advertised claiming incredible horsepower numbers. We all know Nascar heads make great power, but bolting them to Mom's station wagon will not put the car into the 9's at the local drag strip. Engine combinations need to be laid out BEFORE the cash is laid out. This will help them avoid disappointments and costly mistakes. Also, in relation to this, suggest parts that can be used during the "evolution" process. My first "drag" car ran 14.20 in the quarter, years later I am running high 9's. Did I spend too much money evolving to faster ET's? You bet! No guidance, just marketing hype in every magazine I read lead me astray. Help them decide where they want to be when the project is completed, then judge which parts to buy NOW, and which to buy later. Also, which parts have good resale value when it's time to make the next step towards their final goal. Recouping dollars helps with the budget, that's why there are swap meets, online auctions, etc. Also, simplicity in their design would help avoid depression and canceling their projects. If it's too complicated, they may shy away from it and not do it at all.
Now then, my last suggestion (I could go on forever if I'm not careful) would be tool selection. You have slightly more "wrench time" than I do, so I know you will appreciate the importance of this: Use the RIGHT tool for the job. How many times have you seen young mechanics beating away on something with the wrong tool, wasting time, damaging parts, and aggravating themselves to no end? In a book like this, I would highly recommend picture references with your "Tool Selection and Usage" section. Damaging parts by using the incorrect tool or using tools incorrectly can be just as costly as choosing the wrong parts to begin with.
I should probably stop for now, don't want to write a book on suggestions for writing a book.
Would be glad to help out, compare notes, kick ideas around with you. Anytime. I've been training mechanics for years. let me know if you need any help. Good luck! - Don, New York