I've been closely asking myself what I would go for in the complicated RMs.
I love the RM021 or the RM027 but the budgets are an issue.
And I could go for the origins of the brand with the RM002 or the RM004.
Btw, I didn't realized the RM003 was bigger than the RM002: I thought only the Dual Time disk was added.
Anyway, the RM004 is thicker and, as you say, the servicing is often needed.
I came to the same conclusion as you did: a late RM002 would have been my choice for a tourbillon RM.
So congratulations Roger and I'm sure you'll enjoy it a lot.
Thanks for sharing and please feel free to bring some wristshots in the wild from time to time 
Cheers, Mark