There are some of us and there a few posts on here about Moulton restorations. If you are looking to buy an F-frame to do up, ebay usually has a range of options at different degrees of knackerment. I'd recommend looking at the Moulton Club website https://www.moultonbuzz.com/ as it gives links to resources for restoration like Moulton Preservation. If you join - £22.50 - you get access to the sales & wants pages as well - there are a couple of recent (August) posts on there for Series 1s and one for a Mk 3.
And it is the annual Moulton Meet at Bradford on Avon next weekend, 8-10 Sept (only open to members) which may be a good source of an old machine and advice if you can get there.