here's the cabin bulkhead "in the bag".....in the foreground you can see my resin trap that I built from a block of MDF and an acrylic bucket from wal-mart. This is a good example of how NOT to make a vacuume resin trap. Turns out that the edge porosity of MDF was enough to leak 10 in. of Hg leaving me thinking that I had a leak in my bag. Afterwards, I tested my vac pump without the trap and it pulled a full 30 in. Merc.......