Hi Charley,
Lots of light!
I just this week started my own sandblasting cabinet.
Forgot to take a before pic but this was a ally enclosure of some sort Just a regular rectangular box with 5 sides. It had a few cutouts and whatnots to patch or remove. I cut and split it to make the tapered sides. Got it welded and patched to hold its shape whilst I progress along.
The window is cut out but thats about it so far. Still looking at gloves so when I decide I will make the flanges to suit. Make sure yor gloves are long enough you can reach all the areas inside your cabinet.
Because of static build up they say to use low voltage lighting inside but the design I am using recommends put the lights on the outside in their own little ventilated enclosure and shine through a port window. That way you can use really bright mains powered lights.
Building the work shelf for inside at the moment.
The best design for ease of use is have the hand entry holes on a vertical plane, and the viewing window inclined at an angle. Because I am working with an existing shape mine is going to have the roof sloping away as well, but ideally you would want the working area square, as I am loosing some working room inside.
Make sure all the surfaces inside are vertical or inclined. If you have a door on a vertical surface you need to make overhanging lips so that the media doesnt build up on edges and fall out when you open the door. Make sure that it is well sealed. Get really bright lights.
Put baffles on your vac ports so you reduce the media you suck out. Paint it white inside to maximise the really super bright lights you will want.
I will keep you posted
Cheers Phil