Irregular Plywood Tiled floor - gap advice

Hi There

I know there is already advice on here about plywood floor gaps - but I'm installing one which has very irregular, angled tiles. Similar to this temporary one I made for an art fair last year but more professionally done!

http://static1.squarespace.com/stat...bd44eb8/1413791976135/floor2.jpg?format=1500w



I'm using the following:

- 8mm structural hardwood ply undersheeting - nailed to original floorboards with 10mm gap around outer edge.

- 15/18mm structural hardwood ply tiles - pinned and glued to the undersheeting

- emulsion & then plenty of coats of floor varnish



My questions / quandaries are:

- Because I'm pinning and gluing the tiles to the undersheeting - can I get away with no gap between tiles ?

- Should I still be leaving 10mm around the outer edge of the floor as well as the undersheets - or can I get away with less ?


Any constructive tips welcome!

Thanks