You're in luck... The ship is a Space Yacht actually... it's bigger than the Falcon IIRC, and actually MicroMachines MADE a MM of the ship. Maybe not the Lady Luck but like a YT-1300 Freighter it's the same shape/look...
There is also sightings of them in RPG's and also in video games. In particular the space yacht appears in X-Wing: Alliance. It's a fairly simple looking craft. If I see its image online I"ll gladly post it for you. Unfortunately a truly cohesive and definitive guide to ships and vehicles doesn't exist. The writers who've put out the "Complete Guide" series haven't come CLOSE to touching all the vehicles and ships seen and created in the EU. There's so many 2-legged walker designs alone that you could probably fill a book with just walkers in general.
I'll look for that image though if I can find it.
and right off the bat...
I think this is from the Complete Guide to Vehicles/Vessels.
This is a 3D rendering of some sort. Possibly from a game or a random net artist.
I found these just by doing a simple Yahoo Image Search for "Star Wars Lady Luck", so remember that Yahoo/Google are your friend when you just want a picture. I'm sure the CGtVV has at least some dimensions for the vessel too.