KillTeam boards and 40k

[roguechaplain]

I have three KillTeam boards - the original one, the manufactorum one and the munitorum one. Using the imperial city side, you can link them together into a single battlefield, which is great; but this only works along the long sides. Which means I can play at 22x30 (KillTeam size), 44x30 (combat patrol or incursion), or 66x30 (not really anything). And if I get another copy of the original board, I can flip it over and create an 88x30 strip. 

 

Now, I can rearrange them into a 44x60 map, but then I lose the matching edges, which is a nice feature. Does anyone know of any other boards out there that visually link up to the short edges of the ones I have, to make a new size 40k battlefield? Or do I have all of them, and GW just didn't quite think it through (or thought it through, and decided they wanted me to buy two sets of the newer boards...)

 

(i was quite keen to pick up a fourth board to have a visually pleasing table, but no point in doing that if all I can do with it is make a ridiculously long runway to fight over.)