HI torsten
All parcels overseas are on volume not weight, the computer can not work this out that small items can be packed in to other items,
large boxes as radio will not fit in a kit, it needs a human to work things out for best packing, ie motors etc can be boxed an put in the hull, radio, the kit can be put in a longer box, and the radio added,
always ask for a quote on shipping mixed items, you get the best price them.
500 ah Nimh are to large this will be for both motors being riven together, for independent control best use 2 x 200 ah, one for each motor.
you do not need a v tail mixer, drive independent control of each motor, more control amd more fun, but more skill and practice.
Charger will cone with a UK plug, you will need a adapter to use in Europe
Shipping for one large box approx £33.00 to Belgium
No need for a fan at all ?
Regards
Deans Marine
p s have a look at my one sailing on U tube
https://www.youtube.com/watch?v=lE0enr4GxlU