Hello 
I hope you don't mind but I wanted to ask what changes I should make to this cabinet.
It'll be made from 25mm MDF for the most part, the front will be 3 layers of 25mm MDF which will be CNC'd and bonded together.
I have decided to try using 1 inch cylindrical wood for the bracing which I'll drill a hole through the center of and use a piece of threaded steel which will pass right through the whole cabinet. The nuts will be countersunk into the cabinet and filled over.
I also want to use steel rods to attach the woofer to the cabinet on 4 of the 6 fixing points.
An idea for coating the internal surfaces is to use a layer of polystyrene beads (beanbag filling) about 10mm thick which I'll either mix with latex sealing paint and paint on or just glue on. It depends how the beads behave as to which method works best.
I'll use bitumen backed foam for the mid enclosure and the tweeter will be sealed into the front baffle.
What do you think?

I hope you don't mind but I wanted to ask what changes I should make to this cabinet.
It'll be made from 25mm MDF for the most part, the front will be 3 layers of 25mm MDF which will be CNC'd and bonded together.
I have decided to try using 1 inch cylindrical wood for the bracing which I'll drill a hole through the center of and use a piece of threaded steel which will pass right through the whole cabinet. The nuts will be countersunk into the cabinet and filled over.
I also want to use steel rods to attach the woofer to the cabinet on 4 of the 6 fixing points.
An idea for coating the internal surfaces is to use a layer of polystyrene beads (beanbag filling) about 10mm thick which I'll either mix with latex sealing paint and paint on or just glue on. It depends how the beads behave as to which method works best.
I'll use bitumen backed foam for the mid enclosure and the tweeter will be sealed into the front baffle.
What do you think?