Hey Jersey - The EchoTec is modular in design; however, the space under the aft bed is too small for some of the components and reaching beneath them to service filters and all would be inconveniently tight. I agree about the areas beneath the forward V-bed and have that location identified as a fallback option - I just don't want to give up a part of all that handy space there if I can work other options.
The dimensions on the EchoTec website I've been planning with were published larger by 111mm than actual, so the PIA of finding a cooling solution in the engine compartment is thankfully off the cards now.
The area beneath the port aft-facing portion of the salon seat looks good for the high pressure pump and I'm hoping the 40" pressure vessel extending aft under the same inboard-facing seat will fit. The compartment also looks large enough for the strainer and filters - however, I'm going to measure a few times when I have the components on site during the upcoming week.
I take Nigel's point of the possibility of under-utilising a water maker... it could seem to be an extravagance that does require care and feeding resources to use. That said, the convenience of having an on-board source of clean water, at least for me, outweighs the flushing and pickling routines. Plus, I reckon those times may be considerably less than other water supply alternatives for how I like to cruise. So.. why not...?
Thanks for your feedback.