Well... I took BladeRunner's advice and devised the lighter weight design above... here you see the template glued to the back plate and the milling of the surface to RAM height has begun. I had already drilled and milled the recesses for the various SMCs that stick up.
Here I've milled the surface to 0.058" depth for the RAM and left a small square for the back of the GPU area.
Here I've begun milling out the rough shape of the block... did you bring your shovel?
Two corners milled away and one just short so I could still use it for an anchor...
Here's the roughed shape next to the back of the card... the side of the block you are seeing will fit on the side of the card you are seeing. Again, note the cooling square for the back of the GPU...
That's it for today... I will get the final shape milled tomorrow and begin roughing in the front block. Cheers!