Thanks for the reply, Greg.
No, I will not buy the parts before I have a body.
And since I have never built one before, I am not skilled at routing, (have no routing experience at all) I don't have any router jigs and I don't have a test-proven guitar plan yet.
Jeezuz, I don't have a router yet! Intend to rent one for the job.
No, I will not buy all those expensive parts just to find out that I can't build the body. Don't need a pile of guitar parts and I don't wan to be forced to buy a replacement body for them just because it turned out that I can't make one myself.
I don't want to spend money on suspicious eBay plans and templates too.
But we discussed this already several posts back.
About the calculating method you described - this is exactly what I did. I used the basic body measurements (got them from Marty) and I scaled the Warmoth photo so it fit them.
This does not guarantee me anything. Maybe the photo was angled, maybe my Imperial to Metric conversion was not precise, maybe I just did something wrong and so on... That's why I need someone to check if my plan is OK.
I need to know this for sure before I start it all.