Battery switch ?

[sidelock]

I didn't realize it could get so complicated, I also have two batteries for the new MinnKota going in the front fish box as well as an onboard charger. I wasn't planning on moving the starting battery from the transom to the console because I thought the weight of the two AGM batteries in the bow would compensate for the weight. I thought I would keep them seperate/isolated & simple but it seems like other components need to be added to the equation such as an ACR, new/longer outboard cables,starting battery relocation etc. At least the previous owner left a couple of fish/lines from the rear battery compartment to the console for future addition of wires/cables when he replaced the fuel tank,so that shouldn't be too much of an issue if I decide to relocate the starting battery.
How difficult/possible would it be to fish wires from the front fish box of an 18'SF to the console should I choose to integrade the electric motor batteries & the relocated starting battery ? Any idea how much it woul cost to have longer cables made ?