Planning...
I seem to do an awful lot of it these days. I fully intended to do a full day in the container but a sore back and appalling weather put paid to that.
So, I limited myself to a couple of simple things to sort out.

The fuel tank roll over vent mounting. The actual mounting orientation of this is somewhat of a mystery. The only way I could determine the correct way to mount it was to find out how it works and then design accordingly. This is how it works (copied from Pistonheads forum): 
Inside the unit there are two balls - one plastic and one steel. Normally they are both held down by gravity away from a seat. If petrol enters the unit from the bottom the plastic ball floats up and blocks the outlet by coming into contact with the seat. If the car rolls over the steel ball lies on top of the plastic one holding it against the seat. In normal use air and fuel vapour are free to move in and out of the unit.

So I now know how to mount it correctly

Next was the brackets for the dash (to stop the bottom of it flexing), the tunnel top covers (to join them together) and the AFR meter connector (power and RPM signals from the loom). These are all formed from 1" Aluminium strip, easy!

Finally, now having all the components for my new fuel level sight gauge, I should really get off my ar$e and put it together....