I'm with both of you. I don't own many aftermarket item. I'm very much oldschool when it comes to that. There are e few things that are next to impossible to scratch build, such as spoked wheels, so I do own a few items.
Beautiful start on your model. I've always liked that airplane. I ran into an old Air Progress from when the plane was just a proposal. Did you know that there was a proposed light transport version with a different cockpit nacelle? I'll post some pics soon.