Jones,
I wasn't suggesting this is anywhere close, but then neither is the
electric powered version.
We don't know enough about it to start a design, but consider Defkalion
claim a much higher COP and to be able to switch it on and off. If heat
is required, some aviation fuel could be burnt to supply it.
Possibly some hybrid design, burning fuel to get added thrust for take
off and then having LENR provide the cruise power. This is pre Wright
Bros days for development but if LENR is what we currently think it is,
it would be surprising if the control problems were not solved. The
point is, a full load of fuel for a 747 can be 126,000 lb. Probably
limited more by space than weight.