Woah, yes you are mad!.
Also am i mad for thinking about upgrading my Carrack to a 600i?
600i is a damn sexy ship and definitely the best (my opinion) thing since the Carrack concept, but the Carrack is still awesome. Besides you don't want to end up regretting it once it gets its rework which may include significant design changes.
I ccu'd my BMM to the 600i Explorer, so now I have both 600iE and Carrack in the same package (UEE Explorer pack). Had the good fortune of ccuing the Terrapin to BMM before its price hike making the jump to 600i even smaller - pretty good value in that pack). Intending to use 600iE as multirole including things like bounty hunting and other random missions in civilised areas, and Carrack will be the "boldly go" into unknown territory or areas far from centres of civilisation.