Installation was considerably simplified by the pre-installed (by Hanse) wiring on my 415. This included power (both permanent (for station pre-set retention) and switched) supplies plus 2 sets of speaker wires (cockpit and saloon). The wiring loom was hidden beneath the distribution board near the switch panel, with the speaker wires terminating near the (Hanse) chosen locations for the speakers. 

In the saloon, there were partial cut-outs already prepared for the Fusion speakers in 2 of the seat bases, with the speaker wires terminating (but hidden) nearby. In the cockpit, I had difficulty finding the hidden speaker wires but they were there behind the locker panels. I had to cut the speaker holes first to find them, though!

The positions for the Fusion head unit and the speakers may well be different on the 630. It may also not be pre-wired like the 415, although I suspect it will be and maybe even have speaker wires leading to additional cabins. If possible, before proceeding, find a 630 with an installed Fusion system and check where the head unit and speakers are mounted. Take a look at the wiring, if you can. You could also ask your dealer, although they may deny the existence of the pre-installed wiring and direct you towards their installation service!

I also installed a TV/DVD on the forward bulkhead. This needs a mast mounted antenna and associated signal booster. I had the antenna installed before the mast was stepped.

If you are looking for a PC based multi-media system, or equivalent (probably the way to go if funds are not limited) then someone better qualified than I on such systems may reply shortly.