There are .blend files available for all the the models we use in the game currently. The easiest way to get them is from the SVN server on the sourceforge page. The ogre .mesh file format is created by blender
from the .blend file. That is the format you will want to work in and submit your models in. If you don't want to use blender as your 3d editor that is fine too, just export them to .blend format before you submit them. If your 3d editor does not support exporting to .blend format you can simply save it in some other format then open it in blender (which can read almost anything) and then use that to save it as a .blend file. Once you get the model submitted to us we can handle getting it exported to .mesh format and into the game.
For scaling we use 1 blender unit = 1 meter. The tiles are 1 x 1 meters on the floor and 3 meters high with 0.25 meters extending "down" from 0.0 to accommodate water, lava, etc. The knight is something like 2.5 meters tall.
Also, since you are more into furniture, rooms, etc, we need beds for creatures as well. Ideally each creature would have its own individual bed but for now we plan to make something like 5 or 6 basic ones and then have different creatures share the designs. Currently I think we only have one bed which is just a standard bed with a mattress. We also are looking for a pile of treasure for the dragon to sleep on, a straw bed on the floor for ogres, as well as any other designs you think might be interesting for dungeon creatures to sleep on/in.
P.S. if you are working on stuff for the shop, note that there is a thread here on the
forge, which already has some nice looking models for you to use as a guide for what kind of things we are looking for, as well as what we already have.
-Buck