Outside drain replacement

[Mike06]

I am trying to tidy up the ouside drain. Currently the upstairs bath and basin, downstairs dishwasher, washing machine and sink all drain into a large brick built drain with cast iron gully that has cracked and come away from the wall. I would like to replace it all with a neat plastic drain. I know I can buy the Osma Drain or similar but this just sits into the existing drain and does not have enough entry holes for all the appliances and they are in the wrong place.
Does anyone make a surround for this or will I have to build one up with brick and render?