AutoCad 2D :: Hatch Pattern For Flooring Tile

I need to create a hatch pattern for a flooring tile that we have currently starting using and I am having real issues getting it to work!! The pattern is meant to be tiles set in a brick type style but with a rolling offset, but the tiles are different sizes - I have one row of 300x600, then a second row of 148 x 600, then another row of 300x600, then another 300x600, then a row of 148x 600, followed by another 148x600. This is the pattern end and needs to repeat itself. I have attached a line drawing of what it needs to look like.

I can get a very basic line drawing showing 300mm and 148mm for the first two lines but then it all goes wrong!