Roger thanks for your post, I looked into making an archtop guitar and saw some incredibly built instruments that was farout looking, but played pretty well, the key thing I learned here was testing the sound board by SLOWLY removing wood and testing the sound tone, this was from the Archtop MASTER himself Benedetto, he would remove most of the wood, then start thumping it with his fingers to hear the tones, and remove more where he knew it would make the changes he was looking for. So the building parts process I do see as too long, but getting the tone, and the setup is the key.
UprightCowboy