Jethro ... close. After the 4th post, the newbie is out of "moderation" but it doesn't show up under his name as "Bolter" until that 5th post is made. (Doesn't really make sense but that's what happens.) On *our* end, we (Moderators) don't have to approve any of his posts after he does the 4th one.
As far as the access to the entire site, he does have access. He can even read a PM from you but he would not be able to respond. He'd get a message saying:
"You cannot add any more replies to this private topic at your current member level."
Once he reaches 'Bolter member level (following 4th post), that statement is removed and he can respond to any PMs.
When a newbie first arrives at the doorway, we try to follow him and approve the posts quickly as they come in. At times, we've engaged enough (seeing that he's online) to post answers to short questions so he'll get that 4th post in.
I'm sure you all will be able to help him ID the engine. Hopefully, walk him thru (or show him
the link) on how to post images, if he needs that help, too.