[Fireskull]

I think the Stirling is WIP

This is probably true. There are many WIP projects right now. Quite often, people quit a project or set it aside for months or more and return to it. Just to finish it from start to end with no interruption takes a few months to create a detailed aeroplane for IL-2 ( depending on how much free time the person has ).

Remember all the talk about the B-26 Martin Marauder WIP? This popular plane has been in posts for years. How far WIP is it now?

Obviously, we need a better system to keep track of WIP projects. Here is another of many needs for unification.

Until then, some of this will be trial and error.