Apologies about the delay and pics, had to host on a different server
Here is an update. I've finally joined all the required pieces and cut to size.
Cutting the service holes wasn't fun, but it had to be done!
Then biscuit joined all the panels together remembering to use an 90' angle ruler to keep things square and in check.
Next step was giving it a good planing and sanding. Here is the almost finished product before the final oil finishes.
For extra strength and stability, i've added L brackets screwed up on all corners.