I also have a great interest in p51 here are my pieces so far
Also have one of the illusive gas mask bags, missing the straps though sadly.
Also have the wrong canteen, but am getting the proper one soon, but one cool thing about my plastic 1q is that it is Canadian, pre 1962.
still yet to get any belts and straps for a decent price online, and haven't had a chance to look in shops but will be going next week.