Thanks guys, it's very much appreciated. Chris, when I worked on the wheel well I needed to do a ton of dry fits to make sure not only that they all fit together but that those extra parts didn't push the halves apart. I had to do a little cutting and sanding on those extra bits to get both outer halves to sit properly. On the engine and spinner, once the propeller is on, the spinner blocks most of the view to the engine. Infact the only real part of the engine you will see is the piston and outer wires... If you're up close and looking slightly to one side you can see the rest of the engine but only just. The collar you're talking about may or may not be the right one depending on which version of engine you want to add. I've seen some pictures with and without the collar. I'm no expert but I believe I've seen the collar on the later versions of P-61's Like the late P-61 B's and certainly the P-61 C's.