solid surface solutions 
Marlan shower trays are always in the right dimension, not like standard sizes which are often not 100% fitting, but because they are always made to measure you will not have this problem. You can choose every length and width up to 1800 and 1250 mm. You can choose the position of the waste in the middle, in a corner, or on a side. Even a position all to your wish is possible.
Marlan® 24 mm flat shower tray with a shallow sloping area, suitable for fitting to concrete or tiled floor, with an outlet of Ø90 mm and Ø117 mm at the top, delivered without top access waste.