[Mr Gazza]

You can very often achieve the same result just by cleaning all the terminals and re-using the old cables.
New cables are clean, so that's an instant improvement anyway.
Fancy new cables can corrode at the terminals as well! So inspecting the connections should be an annual job.

If you make up a cable of 700mm long, it will pass over the front pot and down the nearside of the motor to the starter and become invisible.