Unfortunately the metal P4 chassis will have to wait from us. We have so much on the table it wouldnt make sense atm to delay current plans to get out a metal chassis. I personally wanted a P4 metal chassis as well, I was planning project for it. But, I am happy knowing much better things will be coming out for the time/money invested
As for the road wheels and tires, those will be incoming around the 23rd or 26th. They were supposed to be on the last order
The return rollers will have rubber tires as well (99% sure here, I did not get my sample, but I do have pictures)
I will check on the Ausf F/G idler wheels and sprockets later.
As for the metal barrel and muzzle brake I already have those, they are part number TAG120177. They just get bought as soon as they come in
The P4 is one of my favorite models, I haven't forgot about it, I just have a few bigger projects on the burner. I will see what I can do you for you guys after the Xmas hype has passed here at IMEX.