RE: scale
The easiest way is to just divide by the scale. so a 1/14 model of a 12.67m ship would be:
12.67 / 1 / 14 = 0.905m or 90.5cm
Again
A 1/60 model of 114.8m ship would be:
114.8 / 1 / 60 = 1.9133m or 191.33cm
A littel more complex, A 3/16 model of a 57.95m ship would be:
57.95 / 3 / 16 = 1.2073m or 120.73cm
You will not that my number is 0.25cm different than what Dan got, myn is more accurate because I didn;t convert back and forth between Metric and Imperial. Never switcdh back and forth between systems. Choose one system for your calculation and then in the end convert to what you want to use for your plans.
Its pretty simple. If you have imperial dimensions of your ship make sure to convert the feet into inches.
So a 375'11" ship at 1/50 scale would be.
375' x 12 + 11" = 4511"
4511 / 1 / 50 = 90.22"
Cheers,