The other half enjoys Meccano and other types of construction, on browsing the web for her next project I came across the following

http://www.moah.org/exhibits/archives/constoysmotion/riverboat.html

On further investigation it is still available at one site for $2,500!!!

details 1992 Märklin Set 1082 Mississippi River Boat
Limited Edition 5,409 Parts 47" Long 35 lbs!
Wood Chest As New, Unused Condition...$2,500.00 

Ah,but will it float?

I recall Mechano had a floating hull at one time.
Regards,
Gerald

I saw this Medway Queen at Kew Bridge Steam Museum last year but the Charlotte Dundas model I hadn't seen before.... http://my-meccano.co.uk/0700.html