Congratulations on starting your 'new love' right around Valentine's ...assuming a SO ...does she know about your wayward ways?
Epoxy speed: I don't like working with FAST in cooler temperatures because the viscosity ends up being too high for my taste, even though it does cure alright. When wetting out glass or coating wood, higher viscosity (think "thick sticky pancake syrup") is harder to work with ...I recommend having a jug of FAST hardener around, but use it for emergencies not as a main deal. Instead, I would recommend figuring out how to keep the shop 60-ish plus or minus, then use the standard MEDIUM hardener. You'll enjoy working with it much more and your life will be easier. Note also that epoxy can survive freezing and overheating once it has been mixed and applied ...the cure rate slows to zero when it cools off, but this doesn't hurt it. It continues it's cure when it's warmed up again. If risking working in cool temperatures (especially if humid), make sure you go with a no-blush type of epoxy for sure. Knowing how epoxy cures, you can plan to heat your shop when necessary and when you can let it cool down. Note also that you want to overheat the shop for 3 or 4 hours prior to working if you can, and then let the shop cool as you work. Wood that is heating up while working with epoxy can sometimes out-gas into the epoxy and create little bubbles, but wood that is cooling as the epoxy is curing tends to suck the epoxy into the wood ...this creates a more waterproof barrier, no bubbles, and a stronger bond to the wood. Don't use SLOW hardener until you actually prove to yourself that your MEDIUM just plain can't be used in the current (hot) temperatures if that occurs. I never buy SLOW ...but hey, it never gets hot in Alaska!
Between RAKA and Aeromarine epoxies, I'd double check on the blush/no-blush qualities of each (I can't remember which is what) ...but otherwise would probably go with Aeromarine if your shop temperatures might be on the cool side since RAKA has a higher viscosity than Aeromarine. If I recall, Aeromarine is a "shop temperature" epoxy, with 60 F the minimum shop temperature ...but this is fine (noting what I wrote above).
Unless you are going to load your boat pretty heavily, the 150 Honda will work fine. I like the 175 Suzi (as an example) for the best all 'round motor for a GA, but there is already one GA running around with a 140 Suzi on it and doing fine. For the bigger/heavier versions of the boat, 200 hp is ideal. Sometimes the larger displacement motors get better mileage than the smaller ones since they can turn lower rpms and use a higher pitch (and/or larger diameter) prop. With 4-strokes, they tend to get better mileage as rpms drop lower, but 2-strokers tend to have an 'optimum band' for efficiency instead. It's all good...
Brian