I trimmed it to tuck in next to the bottom cross-rail, then it runs up the main posts and is secured at the top with 2 bolts drilled through the posts. I mounted it on the inside of the cabinet so I wouldn't have to seal it all up. To close the back, I used a piece of thin sheet metal from Lowes, right next to the snaplock pipe in the HVAC section. I get a little dust that falls through but it doesn't bother me. It's tough to box in the corners, so I just cheated and used some duct tape. I lined the bottom with plywood in 3 sections: a flat section right below the motor with a 5in pvc coupling glued inside it, then 2 angled sections on either side to help channel the dust.
I am by no means an expert, but I have enclosed the bottom and back of mine. at least do that much (removing the elbow). an removing the 90-degree elbow made the airflow path smoother and it pulls much more dust away with a straight run now.
the difference over a shopvac is amazing. i have worked for a few years without one and bought one over the winter (with a wynn filter attached). if you don't have a dust collecter, seriously consider getting one. if i had a lot of bevels to cut, the 90-degree elbow could go back on with the 4" hose converter attached. since i almost never have the need to do bevel cutting, it doesn't affect me much and i just take the hose off for a few cuts. the only problem with this is the hose will run into the cabinet side when you try to tilt the blade past about 35 degrees.
rather than collecting the dust that falls to the floor of the cabinet, you can get it right off the saw blade. additionally, having the collection hose a few inches away from the blade rather than the bottom of an enclosed stand is a big difference. i wouldn't bother enclosing the cabinet.the whole reason for the dust shroud is so you don't have to. a shop vac with a 2.5" hose just doesn't have enough umph to pull the dust out. it works GREAT with my HF dust collector and 4" hose. I took off the 90-degree elbow on mine and attached a 2.5" to 4" stepped hose converter.
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