And it would be very fun to build. If you could find a deal on an old Avon Redcrest in decent condition that wouldn't be a bad option for a boat your size. If you want to go the quick and dirty route a simple plywood pram is an option too. When we started cruising the Maine coast on a salvaged Erickson 23 I built this plywood dinghy using the rotted remains of the dinghy I had as a kid for a form. Two sheets of AC plywood from the lumberyard and scrap from around the shop gave me a perfectly serviceable $50 dinghy. Towing a rigid dinghy doesn't create significant drag, not as much as an inflatable.

Here we are departing Damariscove I as my wife hanks on the jib.