Best thing to do to your blasting cabinet.

Here are a couple suggestions, for what they are worth. Keep in mind, sometimes advice is worth what you pay for it...

Regarding lights. I have the H.F. bench top cabinet. Not big, but I have blasted a lot of stuff with it. Total restore of two cars and now I do glass & mirror etching. I do not have a light inside, I hang one of these H.F. fluorescent work lights on it. http://www.harborfreight.com/fluorescent-work-light-92079.html
I just use the hooks to hang it on the glass. Works fine. Also, if you have the ability to turn the outside lighting down or off around you it will help you see into the cabinet.

Regarding the window film. I used to buy packs of overhead projector sheets from office supply stores. The are about 8.5" x 11" and it would take 3 sheets to cover the glass. Then a buddy gave me a big roll of used clear plastic film sheets that he used in a print shop. It was going to be tossed as trash. That stuff works pretty good and the sheet were large enough that I could cut them down and get about 3 sheets per.

From another site that I frequent, I am now experimenting with fiberglass screening - the type you buy at Lowes in a roll for screen door/window replacement. A light gray screen. I have been told that this will protect the glass much longer than the plastic sheets. I have probably an hours worth of use so far and it does seem to be working as claimed. Being a light gray, however, it does reduce the lighting inside the cabinet.

For vacuuming, I use a regular shop vac with a good filter on it. I do try and clean the filter after an hours use or so. I very seldom use the blaster for more than a hour at a time anyhow.
C