Just did a measurement from the wall to the radiator, just over 168 which provides me with a very nice 8 feet (16 columns) horizontal and 14 feet (28 rows) deep. This is excellent for many reasons. No need to cut the polycarbonate. I have to use only 7 modules but still it is all good. Big 6" tiles (5" middle).

it is going to be LEGENDARY.

Now on to doing some power tool research