I wish I had ummeli's problem. I just finished (abour 6 months ago) building a modified Revell Growler. I built her as a Tench Class, Guppy II, with interior detail.
If somebody would put out a 1/72 scale Fleet Guppy, he'd have bidding rights on my soul, and first born. I'd prefer a North Atlantic sail, but would accept either an EB or a Portsmouth step sail.
And, not to put too fine a point on it, I'd settle for 1:150 or larger straight Guppy, any sail. But a 1:72 with interior detail would be my dream.
Mike