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Step 7 - brush coated the skeleton with a water based estapol as was doing this inside the house as my cnc machine is the size of a car and takes up most of the shed apart from materials and other machinery.
Step 8 - cut the side panels - 6mm wobbly hoop pine ply - this stuff is magic as it is 3 ply but all the timber grain goes in one direction meaning you can get some awesome curves out of it. So cut this and test fitted and then cut a Rosewood ply that was 1.2mm thick to suit the patterns (join point and speaker allowance) required to fit into the skeleton. Then with some help from my dad we assmbled the side panels with glue in the front and back panel grooves as well as between the 2 different plys and clamped the whole unit together as this was a challenge trying to lock everything in - one one go at it.

The back panel has sections machined for handles, volume controls, external speaker connection points, cooling fan, volt gauge, switches for various items (lighting and components).

Because it is mdf I sealed everything but didn't want to screw into the end grain as it splits easily. So all held together with glue - high quality type of pva glue. I hope it never goes under water (flooding) as this thing will blow up like a balloon..... 

I will add some more of the progress over the next few days when time allows.