Son of a gun-ner wrote:1/64th is 28mm high figures. Aren't GW figures nearer 30mm to 32mm? Although, their figures are quite chunky, and appear larger with all their armour. You will find they vary from set to set, and older figures to newer figures.
I would suggest trying 1/56th scale for the figures. Although that would make your 18th conversion even smaller.
How high is that little model? Ground to the top of the main hull, not the two protrusions.
GW vehicles and figures are actually out of scale to each other, with the Space Marine vehicles being especially bad, and getting worse, with GWs scale creep. Every few years, the new Marine minis keep getting bigger.
This is actually the second Rhino version. The first was even smaller. When this model was made, the scale of the figures was still 28mm, and the model was now scaled properly, however was still too small to fit 10 Marines inside. Kind of like the Aliens Colonial Marines APC. We know exactly how big it is. And we also know the like the TARDIS, it's bigger on the inside. GW started to increase the size of the Space Marine minis, an now the model is once again underscale compared to the minis. The Primaris Marines that come with the box set are 38mm, and I think the current Firstborn(real Mk7 Marines) are somewhere around what you said.
I like the older 28mm era, so using the width of gets this. Which would work, barely. Especially if you take the lore into account. The Rhino is an ancient Dark Age of Technology STC product. Therefore, they were around before the Space Marines were created, and was designed for normal humans. It is also currently used by the Adeptus Arbites and the Sisters of Battle, normal humans. It was once a pretty ubiquitous Imperial vehicle, but sincw the Horus Heresy they have become so rare and precious now they're restricted to those three. So it should be cramped for a full 10 man squad of Marines, but do-able. I see it as a capabilty that is used during major battles and emergencies and the like, with most of the routine use being by 5 man combat squads. The squad leader in the TC position on the left, leaving 4 Marines in the troop compartment.