I have finished putting mine together and she has flown
In the end I went for the GT4030-420Kv on 6cell with a 4.5Ah battery and 100A esc
The threaded rod is its own size so I replaced them with carbon push rods.
It has more than enough power on a 15x8, specs say up to 16x10 with that motor but it's more than powerful enough with the 15x8. This is a very slippery airframe compared with my funtana and after a 10min flight I only put 2200mAH back into the lipo charging it after the flight. So I am thinking that a 4000mAh battery would be fine for 10mins