I've nicked this idea from a few places, but in case you didn't know here's the skinny;
Hawk Wargames - producers of the 10mm Sci-Fi skirmish game DropZone Commader have made the templates for their buildings available for free, allowing Joe Punter to download and print them off to his heart's content.
The recommendation for 6mm epic use is to scale them down to 50-60%
My hot tip is to mount them on my favourite of all materials - the "1' x 1' self adhesive vinyl floor tile" - available in packs of 6 for £1 in Poundland and £Stretcher.
N.b. these are great for everything from basing, making board tiles, cutting boards etc, they come in various stiffness's and thickness's for just about any job (some even look OK without painting them!)
Also, the carpet ones make great ploughed fields for Flames of War.
The vinyl is great for mounting the printed buildings on, as;
1) it's self adhesive on one side, so no gluing required.
2) scoring with a craft knife allows it to be 'snapped' along an edge cleanly for joints
3) its pretty study when built.
Here's what i did tonight, and what i learned at the end...
So, lessons learned;
1, notice the'lip' on the buildings, first one i didn't and as a result it has a flat roof.
2. score on the correct side where you want it to snap over (this hurt my brain working it out for some reason)
3. some of the buildings come with nice accessories, like balconies or air con units etc. these are fiddly to use with the thicker vinyl, but look good.
4. maybe worth scaling to 40% for some as they are quite big in comparison with the old Space Marine buildings.