Vincent,
No problem with your questions, that's what this forum is all about. Never hesitate to ask.
Props: I started out with a 3-blade aluminum 15" diameter 17" pitch. Couldn't get more than 5300 RPM at WOT, so changed to a 15" pitch and it works fine. WOT gives me 5950 RPM and 36 knots (and burns a shocking 18 GPH). I may at some point upgrade to a 4-blade stainless but it is very low on the priority list (and very expensive). Normal cruising speed is approximately 3800 RPM, 7GPH, 20 KTS, 3.0 NM/GAL, sea conditions permitting.
Control cables: you can order them in several different lengths, mine are 20 feet. More important is the NMEA2000 data cable. The one that came with the engine barely made it into the helm cabinet and I had to get an extension cable to marry it up to the backbone.
Fuel tanks: custom made by Bay Welding in Homer AK. They build awesome aluminum boats and are great guys. Mine are made from 1/4" plate and are strong enough to hang from the stringers by their top flanges. I didn't want them laying on the bottom of the boat, because when they ae full they weigh close to 400 lbs each. I designed them to be 50 gallons each but the ended up holding a bit less than that, maybe 45 or so. I only use the aft tank for long range runs for trim purposes. A reputable manufacturer is
http://coastlinemarinetanks.com/ and you can order on line. They are in Bellingham WA.
Cheers! And post more pics of your build please!