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Mike, what part of MN are you in? Sounds like you are having the same type of weather that we are dealing with in La Crosse.
Now is the time to plan out what improvements you want to build into your boat. I think you were thinking about a live well. I added a removable ski pylon and rewired to add a new bilge pump and perko switch setup. It's easier to set the road map now then after you set the deck.
I understand your desire to add aluminum to the back. I heard someone say that a plate on the back is the sign of a patch for a bad transom. In the world of the old Crestliners it is protection against the "can opener" effect. The dynamics of the engine over the 10" transom board on mine allowed the engine under torque to twist and dig the lower tabs of the engine mount into the aluminum stern. When the motor was removed I pounded out the dents and added a 1/4" aluminum mounting plate for the engine to spread out the load. 1/8" aluminum plate won't do much. I am sure it is overkill but, oh well.
As for the engine on your boat. 70 will seem a bit weak on a hull that size. If I remember correctly, my 1972 17' Starcraft was rated at 85 hp. While the Force might not be the best choice maybe a 115 Evinrude V4. (Non-VRO) would be a good option if you ever find a nice older one. I think I found on line that the 1977 18BR is rated for 120 hp max. Do you still have the rating plate in the boat?
Lots to think about. Just one bite at a time and you will be fine. ;-)
Eric