direct manufacture, SIZE:many sizeavailable
We can make them as your requet

1)SIZE:many size available

2) good loading capacity

3) meterial is aluminum and polywooden, 

4) surface: Acrylic

5)wood  be sprayed underneath before assembly with lacquerto waterproof.

FOR YOUR SUGGESTION:

16FT X16FT: (4.8MX4.8M)

1 complete dance floor which is 28 x full panels 4ft x 2ft and 8x half panel 2ft x 2ft, 13 x full aluminium edges, 4 x halfedges and 1 set of 4 corners

30FT X 30FT: (9MX9M)

1 complete dance floor which is 105x full panels 4ft x 2ft and15 x half panel 2ft x 2ft, 24x full aluminium edges, 4 x halfedges and 1 set of 4 corners