Back home and have had a good look and think I will mount it under the floor, then I will only have one pipe going inside, chances of a flood will be less and after some experiments I did while away I think part of the noise problem is from the water lines where they come thru the floor.
Anyway moving the pump will mean I will have somewhere like 9 cnx's that won't flood the inside, just amazing how they have done the plumbing in these things. I will also go to my local supplier and get about 36 of those little red circlips to stop the fittings opening by themselves will probably need more though.
I intend to mount the pump on a rubber pad fastened under the floor to lessen sound/vibration transfer but don't see a need to enclose it as it will have a water tank in front to stop rocks and the pump seems to be water/dirt proof so will just enclose it in a mesh housing, boxing it in would just make a sound box anyway and a pain to get at.
While I'm down there I will finish repositioning the water/drain lines as they are a bloody tangled mess, must have been a Friday build and the apprentice wanted to get to dance classes..............if I ever bought a new one it would have to be local as I would be a dealers worse nightmare, but not much chance of that, rather fix things myself, do it once, do it right.
Couple a days or maybe next week and should have some pics on the mod, unless I go fishing this weekend................life is good.