I haven’t yet decided, I’ve got 5 projects in mind.
1st idea, a Gypsy Locomotive using an old Aristo F1 block.
2nd idea is the Silver Fish from Porky’s Railroad, this would be with a battery drive and cardstock body.
Third up is a Coffee Pot locomotive using ? Drive, Lil Hauler loco body and Scientific boxcar, or a passenger version using 2 LGB Toytrain bodies.
The final idea would be reworking a EZtec 4-4-2 into a 1/22.5 Locomotive with a larger cab and details, it might be the useful on the wine barrel layout. No pic as it’s still just an idea.