If you want to put figures on your diorama there are a few decisions that will have to be made early on.Will you be scratch building or modifying pre-made figures or something in between?If your building figures from scratch then any scale that you feel comfortable with is OK.But if your like most of the rest of us you will be modifying figures to suit your needs.There are a lot of great figures out there now but not in all scales.Take a look at great models.com, they have a lot of figures in many scales.There are more and more all the time and I know if ship modelers were using them they would manufacture them if the demand was there.Right now the armour guys have the greatest variety in 1/35 scale because they have been into dioramas for a long time.The airplane guys building in 1/32 scale will sometimes use the armour stuff when they can.Different manufactures do differ a bit so measure them yourself and you may be surprised. Also remember humans,animals and even tools vary in size in real life 1:1 scale.
I received the Model Expo catalog the other day and was thinking about this thread.There are a few great possibilities.My choice right now would be HMS Vanguard in 1/72 scale.If I had a few thousand extra hours to devout to it ,it would make for a great storyboard diorama either waterline or free standing.There are lots of 1/72 figures available in Napoleonic uniform which could easily be modified to crew the ship.You have a choice to of bare poles,harbor or full sail rig in calm or stormy seas.
There are other choices too.1/48,1/32,1/24 and even HO for the RR guys and even my current scale 1/16th.Numerous figures are available for all of these. to be cont.......