Steven: Man your construction is getting me all pumped up! Got the tube amp and the table saw so no more excuses!
Are you using stock Belle dimensions other than the 1" up grade. When you increased the bass cabinet wall thickness to 1" you accounted for that dimensionally. Are you making the top cabinet the same width and depth as the bottom? I would love to see the dimensional drawings to account for the 1" material if you don't mind sharing.
I'll have to account for the mid horn and tweeter between the ports on my build, are you still planning a two way system?
Great idea on the the braces. Did you use screws on the base bins or just glue it up under pressure?
Stay strong in your resolve!
Rob