No exacts for you, but here's some ideas...you can use "free-air" speakers instead of those that must be used in enclosures. This means that you can mount the speakers wherever you find space, having sub-woofers without the added cabinets taking up all the space. Also, with this plan, you can mount the amps wherever you like, just run wires where you need them. I have mounted amps under seats, in seats, in kick-panels, in dashes, etc. Hope I've given you some help, but let me know if you have any more questions.
p.s. Nice to hear from Ireland!