Perhaps it is an excusable mistake in some cases, but in this, I feel it is not. I feel that there is a good reason a campaign designer should lurk before attempting something, rather than impatiently going about and starting it.
He is attempting to create a fifty mission campaign, and I doubt it will be any good if he hasn't looked at any other third party campaigns, and just started doing the thing on his own. I say this because he may be wasting is effort. If he comes back a year from now and releases basically another SGWP2, then the "huge amount of work" he has done was all worthless.
I'm not saying that this will definitely be the case, but I am skeptical.
The logic being that without having the benefit of having lurked and reading story idea threads and tips on campaign design, it can't possibly be very good. It may have a good concept and good execution, but it could have been done before, or have some contradictions that were widely discussed. If he has lurked, then he should know that calling your own campaign FS3 is dumb. But he hasn't, so there's always the worry that this will be a) crap, b) something that was already done before, or c) something decent but with more (plot)holes than a fishing net.
Of course, I could be wrong. In fact, I'd probably rather be, and have spuds come and clarify, then proceed to show some screenshots of his awesome work.
Dropping a three-line post and calling it FS3 has me worrying, though.
Perhaps I shouldn't have been so...hostile about it...