So.....
I'm working on a project called "HexHammer" that takes my ProHammer rule set and adapts it for use on a Hex Board using the 5mm scale of Epic. This would basically let you build a
40K army using Epic miniatures, for which there is a thriving 3rd party / 3D printing ecosystem. Alternatively, you could even just use blank tokens and draw your forces on the tokens.
The image below shows some of the basic concepts. Each "hex" is planned to be a 3.75" hex (corner to corner dimension). I'm working on designing a set of 120 tiles that can be ordered from a print-on-demand service (e.g. the GameCrafter). Each hex represents a 6" wide area of the board, so an 8 x 12 hex layout is equivalent to a 4' x 6' table.
Each hex is further divided into three sub-areas, each representing 3" of space. The core of the rules is assigning stacking limits to these spaces - which is generally one "base" worth of models in a 3" zone. A base would be, for example, up to 6 infantry-sized models, up to 3 large figurine models (e.g. crisis suits, bikers), 1 large model (e.g. monstrous creature). Small vehicles might take up one base (e.g. land speeders), whereas larger vehicles (e.g. leman russ, land raider) would take up to two. I did some rough calculations on actual model spacing to get a feel for what's possible and makes sense on all of this.
One side of the hex tiles will be open terrain, and the other side will have various terrains (ruins, forest, hedgerows, barricades, swamps, etc.). You'll be able to build out the board manually using the terrain, or also randomly flip over clumps of tiles and see what you get