I don't know how you did that, but that was AWESOME!!
For everyone else, the blower motor will lie low in the bilge area, usually screwed to a piece of plywood that has been epoxyed or resined to the bottom of the hull.
Your blower motor will last FAR longer if you don't mount it low... you just need the inlet low, so use some of the same ducting you do on the exhaust side to position the inlet low in the bilge. This will both keep the blower out of water, as well as keep some of the crap out of it. (it has to make it up the inlet tube first, so small things like the bobber you lost aren't going to get sucked up.)
Your blower motor will last FAR longer if you don't mount it low... you just need the inlet low, so use some of the same ducting you do on the exhaust side to position the inlet low in the bilge. This will both keep the blower out of water, as well as keep some of the crap out of it. (it has to make it up the inlet tube first, so small things like the bobber you lost aren't going to get sucked up.)