Interesting point raised the other day by a glider pilot who's been learning on a "TMG" = engine on front, prop on front, fixed undercarriage.
If he wants to fly a "pop up" engined SLMG with retractable undercarriage what difference training would (in theory) be needed? (He's been flying a retractable u/c glider for years)
Even more interesting if difference training for the pop up engine is required, where could he get it? There's no-one I've heard of who offers formal training on one.