When
shopping for my most recent cruiser, I made a similar paper grid. This was more to identify which boats I wanted to look at more closely. (Once I decided which boats I wanted to look at, I had a list a few pages long of things to inspect.)
Some of the things that I wanted to compare were probably differnet to what you wish compare, so I'd recommend just making your own.
For me some of the things were:
Year, Make, length and location.
Asking
Price
Engine type, HP, year,
Rebuild, Hours
Holding tank
Bimini
Fridge (yes, no, type, retrofit or original?)
Anchors and
Rode
GPS/Chartplotter
general condition
Stove/oven
Other:
For me things, like whether or not it had a working
VHF were minor enough, they did not affect my decision to look at a boat. Certatinly there were things which are even more important like does it have
blisters,
delamination, functioning seacocks, condition of
sails, issues with the stuffing box,
rigging that needs to be replaced, etc, but these were issues I'd likely not know until I actually inspected the vessel.
I should also add, before I got to this point, I had already prioritized certain models and knew certain characteristics, such as
draft, sleeping areas, handling characteristics, etc. so that was not part of my grid comparison.
When it came to comparing different models, I didn't really try to analytically offeset the difference, but rather looked more generally at what it would take to get each one
cruise ready, how this compared to a fair market price for that model and what I'd get out of these differences in terms of functionality, enjoyment and resale. I passed on a
Morgan OI, that even after
repairs was much cheaper than the boat I ended up
purchasing. The decisions was due to the erogomic differences, headache factor of upgrades needed, resale and what I was willing to spend.
In the end, for me, it can only be part formula. I calculate what it will cost to address any deficiencies, but then I ask myself:
Do I want to buy boat X with it's needed upgrades and characteristics for price A
or buy boat Z with it's needed upgrades and characterisitcs for price B?