Many scales derive from lovely old English units.
1/48 is 1/4" = 1'-0" (1" = 4'-0", or 1"=48")
1/64 is 3/16" = 1'-0"
1/72 is 1/6" = 1'-0" (1" = 6'-0") and really not an "architectural" scale)
1/96 is 1/8" = 1'-0" (1" = 8'-0")
and so on.
"Metric" scales of 1/50; 1/60; 1/75, and 1/100 will produce reasonably similar models in size, and allows some "cheating" in using similarly scaled items.
I will, though, strongly suggest selecting a scale and sticking to it. Because proportions are important for perception. You would not want to show a ladder with to-scale 60cm steps (actual steps are going to be 20-30cm apart). Decks are between 1.75m and 2m apart vertically. Making them a different dimension just "looks" off.
Also, the dimensions of wooden ships are almost always ratios. Lavery et al have tabulated these values, which is very handy. Overall length will tell you the rule-of-thumb mast diameters, which then inform yard dimensions.
All of this actually makes your life a little easier. Knowing, by table, the size of a bower anchor prevents putting a 3m 2 tonne 1st rate anchor on a 25-30m corvette (bower will be 1.8-2m and around 875kg, so, you'd want, at 1:60, about a 25-30mm anchor).
The anchor cable, among other cordage, is also tabulated, so, you'd know you'd want about a 1m circumference line, so that's ±318mm diameter, about 5mm at 1/60.
If, though, this is at 1/70, that 1m anchor line is only 4.5mm.
Scale matters, and is no limitation on artistic freedom.