I transited the Erie a few years ago Going up the Hudson, I recommend 'Hop-O-Nose' to unstep your mast. They will have wood scraps, but if you don't have a jig saw, a drill and a bunch of fasteners on-board, you may want to pre-make your supports. On your Hunder DS, you could lash directly to your superstructure, but I would get a 2 ft long 2x8 and cut a 'U' shape in it to set the mast in. Then use U bolts to secure that board to the superstructure putting some tape under the U bolts to prevent scratching the tubing. Typically I see 'X' shape 2x4 supports in the bow and you want another support at the mast step. Lash the mast to the supports and the supports to the toe rail or other hard spot. Ratchet straps are the best way to secure the mast. Make sure you run a pair fore and aft, not just athwartship... I think the min bridge clearance is 15ft. So you are probably fine, but just ensure your mast on top of the superstructure will pass under all bridges! Not sure your diesel
tankage, but with my 25 gal tank I had to use jerry cans to make it between fuel
stops. be aware of that. The NY state guide to the canal is a good reference and you'll need a canal permit
... explore here Boating on the Canals - New York State Canals
BTW, the first lock, Troy lock (ch 16), is the worst with pipes set into the wall I believe 50 ft apart. So you have to pass a line around just 1 pipe and then fend the bow and stern off the wall.. A bit of a pain with 2 people. The Erie locks (ch 13) all have ropes hanging down the wall every 15 ft or so and are pretty easy to deal with.