The BattleForce rules are in Strategic Operations, if i'm not mistaken. But I think the suggestion was to use the BattleForce minis with BT rules, simply for different scale. I've made a couple of 1/937th scale minis and that's kind of fun because it's the same vertical scale as horizontal scale (normally BT uses different vertical and horizontal scales). But the 1/937th minis are really too small to pretty up. 1/500 is a good compromise.
I'm of the opinion that if you're going to do a travel-pack style of miniatures and games, then you're not going small enough.
Of course, this is coming from the guy who plays with really tiny, scratch-built stuff on stock BT maps. When I have a camera, I'll update my collection of micromechs in the minis forums. If you want large scale games on tiny maps with small minis, then nothing beats 2 or 3mm scale. :D
But, I've always wanted to do infantry scale combat. It'd be fun to work up the interior details of an office building, place that on the table as infantry make their way in and duke it out with security or other defenders.
25mm would be ideal for getting the visual appeal, but I've actually looked at using the old 8mm infantry, individually based. Not much of a real change from the current stock scale of minis. You can get a really large building that has a huge ground circumference, and multiple floors spread out over a single table that way. After all, at z-scale, 100 feet is approximately 5.5 inches.
If you do go bigger, I highly recommend that turn scale be condensed. 2.5 to 5 second turns gives you slower troopers and vehicles. You can even track stuff with a higher RoF a little better, showing their advantage over stuff that can fire every so often. Imagine being able to get 4 turns of fire on a BattleMech before it opens up and smears your platoon.
Of course, damage wouldn't be as high, the more you spread it out over time.
Going smaller and larger still appeal to me in many ways.
