Karel Lootens more like a water cooled 22-16 stator brushless as it's a racing boat, you'll be looking at 3000+ KV and an ESC capable of over 40A, ideally also water cooled. a small drone motor will overheat and likely not have the power to move the water with much success...

Karel Lootens you'll need more power than that to make this into the race boat it can be.

Karel Lootens yes, all ewelink smart devices can work with Google as ewelink is a "made for Google home" partner

Karel Lootens anywhere on the bottom two rails. the bottom pins are - the middle pins are + the B_VCC slot is for a dedicated battery. If you have an ESC with BEC (Battery Elimination Circuit) just plug it into the throttle slot (typically 3) and it will power the power bus (bottom two rows of pins) without can also take 8.4v!! this will be the case if they are HV versions. If not, use a 6v pack (4 or 5 cell NiCd or NiMH)

Karel Lootens maybe capable of resisting a bit of spray, but certainly not submersible

Karel Lootens yes, 9g * 4 for flaps and ailerons, 25g * 2 for rudder and elevator

Karel Lootens any of the bottom two pin rows can be used to power the receiver. there is a dedicated VCC port, bottom pin is neg, middle pin is pos

Karel Lootens yes, it's a PNP, so quite literally plug in and fly, apart from assembling wings and putting on the landing gear, everything has been done, including decals (which can be easily removed)