Wren Free Turbine Plans

[peterl95124]

Unfortunately the translation leads to misunderstandings,
do you mean a reverse flow turbine like this?
https://www.baronerosso.it/modellismo_articoli/show/542/turbina-jmb-t-120.html

I would do that if a short forward-flow combustor proved impossible / infeasible, but we know that the JPX-240 had a short forward-flow combustor, so that's what I'd try first.