Dont forget the speed controller for this thing would be a monster
with all the timing issues to go with it just like the RC model kind.
And one of the issues with EDF is the friggen heat from these
brushless motors spinning at such high rpms.
To save the bearings you have to design in some sort of liquid cooling
or heat sink. Then there is the inlet design.
...meaning development of the EDF for this may not be that easy.