depends what you want ... in the past ive mated a honda engine loom to a mini lighting and other bits loom via a single modified fuse box / relay box worked fantastically and cost me best part of £20
im planning the same for this vehicle using the same basics ie chopping the engine loom from the donor ( got the whole loom just tidying to do ) and making ends meet as it were its not that hard aslong as you can see what youve got the labeling at the begining helps understanding what your loom has is the easy bit tracing however can be a bit of a minefield but persevere and you can get a nice rewarding result bit of theory first check 3 times check again then cut (solder if need be) and always remember a soldering iron will fix anything if it goes wron aslong as you are thorough and record what you do
take time to prepare and take time doing you will not go far wrong
