I would like to build a robot

I would like to build a robot with magnetic feet that I can use to inspect the duct work in my house. One of the most energy draining appliances in the common home is the HVAC system. If the duct work has holes or other large gaps, then the HVAC must work even harder (i.e., be even more inefficient) to achieve the temperatures desired by the occupants. My house is old, and the duct work is leaky (as measured by a flow balance of the system). I would like to make a robot that can be used to explore this part of my house to determine what I should do next. After looking through your website I'm thinking a combination of the hexapod structure with the modified feet of the Galapagos and a camera on a tilt/pan setup.