I have built several kits over the years but never built cabinets from scratch. I would share the following thoughts:
--Typically with well designed speakers, your $600 investment ought to get you speakers that compete with finished speakers at several times that price. Often the quality of the drivers and crossover components is far higher.
--I would not worry about doing all the testing noted above. A well designed system with cabinet plans has already done that for you.
--I have enjoyed woodworking for years, BUT I would think very carefully about using a fully hardwood cabinet. I would wonder about stability issues, joint integrity over time. Not to worried about damaging the drivers however. I would suggest you consider a hybrid approach. What about a mdf flat back that you attach solid hardwood side panels? Could look very sharp and would be solid as a rock.
Go for it and good luck!

