A few things...
Sorry, but I can't find any information or reference to a "Museum Scale"
...especially nothing about a standard 1/16 Museum scale.
I included 1/14 scale in my original list of sizes,
and yet 1/14 does not even appear in the
List of Scale Model sizes on Wikipedia
**.
I think the choices are the larger 1/12 scale, 1/16 scale or 1/18 scale.
All of which cover some forms of Vehicle Modeling.
12" Action Man/GIJoe/Barbie are basically 1/6 scale (based on a 6ft human)
Therefore 1/12 is roughly a 6" figure and 1/24 is roughly a 3" figure.
**
1:18 -16.93 mm - Cars made from kits, children's dollhouses. G.I. Joe figures and vehicles is in this scale, although the figures are compatible with 1:16 vehicles rather than 1:18 cars.
1:16 -19.05 mm - Live steam trains (non-ridable), Figures. Ertl's farm and construction machinery
1:13 -23.44 mm - Aurora "Monster Scenes" and "Prehistoric Scenes" Kits.
1:12 -25.40 mm - Action figures, Model cars (static and RC driven), Live steam trains (non-ridable), dollhouses for adult collectors, motorcycles
.......................
I think I am going with 1/16 scale or 1/12 scale?
deciding factor will be whether you want the bigger model with a couple of split parts,
or the smaller scale with all parts intact.