When drilling holes through the deck, it is impossible to be inside with a dust collector at the same time you are outside drilling! It is nice to have a helper that will stand around and wait for the drill to perforate the deck, spewing its dust everywhere while you push with fury on the drill. The truth is, even with help, dust will manage to get away from you and coat everything inside the cabin with itchy fiberglass debris.
This is where a synthetic helper can make your life much easier. I love to use Gorrilla Duct Tape set up into a sheet of sticky goodness. As dust comes flying out, the adhesive will catch it and not let it go. When you are done drilling, all you need to do is fold the sheet over on itself and all the mess will remain contained.
When you attach it to the underside of the deck, you want to leave a pocket where the drill bit can exit without damaging the sheet. All you need to do is stick the edges on and leave a bit of a belly where you expect the drill to exit. This lets you drill away without fear of tearing a hole in the sheet or of dust flying everywhere.
Now you can drill all your holes in rapid succession without worrying about creating a disaster scene inside the cabin!