I have a 2007 Cruiser33 and have run several new cables from the Nav Station to the Binacle for Data and Remote VHF Mic the route its relatively obvious and easy to follow existing cable runs....
NMEA Data extension from Binacle Chartplotter to +Nav Station. -> NMEA multiplex/Splitter mounted behind Electrical Panel.
VHF second Handset multicore.
CO and LPG alarm sensor cables
Route follow existing cables down into Cabin below - there is a large access panel in the very low ceiling directly under the binacle - follow route to rear of cabin bulkhead ( transom area ) down and back along side the Central access chamber where the Exhaust and water heater is located up to the area of the sail drive then use a flat steel cable fishing tool to access the central area from the diesel tank access panel in the Lazarette pull cables to there and then follow the large bundle through the Heads bulkhead, behind the Sink cupboard and through the main cabin bulkhead to behind the Electrical panel next to the Nav Station - Job Done...
AIS GPS Puck - I put this on the Cabin roof next to the Saloon Hatch and ran the cable through under the headlining to the rear bulkhead across behind the curved GRP trim in above the Head door and into the Electrical area.
NO additional cutting or drilling needed ( apart from the fixings for the GPS Puck ) - a fair bit of contortion needed to reach all the under floor access holes...
Best of luck