Obviously producing a kit with a few of the extras such as prop shaft, motor, linkages and rudder are great.
But as with most kits the running gear can suffer as a result of keeping the kit to a reasonable price level.
The club 500 is a great model but when model slipway owned it, they supplied an M5 shaft with plastic bushings, great as a start but the shaft was awful, it 'sticks the motors' when it warms up and reduces speed and run time.
i believe many of us swapped out to something better, i know i did!
I can't say what the new owners are putting in the kit, i hope they have improved in a few places.
With modern advancements in the electronic depts, its probably better to keep the kit as just the moldings and avoid adding the extras, make suggestions on the building instructions would be preferable for those just starting out, many builders will opt to put their own running gear in depending on what they are going to run with.
Which is how lesro/vintagemodelboat co. are doing kits. Just the model and no running gear, leaving the scope open for the builder, so a good model at decent value for cash!
This would also help in reducing costs on shipping given your distance as well as you having to front extra costs for stock. That can be pricey, average cost of a shaft is around £8 give or take, you order say 25 for stock, that's £200 already laid out in one part + the other components on top.
Its up to you obviously how far you wish to go with a kit, just my 2 cents.