The CVX16 for $599 is to cheap ...
It most likely has a piece of plywood over a soft floor, a metal plate over a soft transom, painted hull to cover repairs, fishing boat seats, etc. etc. You might have to drill new holes for your Merc. , not sure what was on it to start with but it wasn't the Force, it looks to new.
The CVX from Fargo is an I/O and would have a cut out for the out drive in transom, if your thinking about using the hull.
Could you mount the Merc on the Larson for next summer ?
I'm guessing that any boat repair shop would look at your C500 and estimate repair thinking that they would have to pull floor out to do a good job on hull.
After talking with shop to make sure that is the case, you could pull the floor out and bring the hull to them.
I'm no expert on fiber glassing or hull repair BUT it sure looks like you would have to do it from the inside to do it right ...
A guess on floor install costs would be $500 to $800 depending on what you used for wood, resin, etc.
Guess is based on my transom/rear stringer/rear floor repair which cost me about $450 ... give or take $100 ... LOL