The 1/350
WEM F-Lighter is the only kit you can
buy. If you want a bigger one, you have to scratch build the vessel. It’s quite
easy, ‘cause the hull and the superstructure are simple boxes. One of my actual
projects is a D-Type Marinefährprahm (MFP-D) in 1/72. MFP-D and AFP had the
same hull, and if you are interested I’ll send you scans of my 1/100 MFP-plans.
For building an AFP you have only to cover the cargo bay, build a new deck
house and add some guns.
You find
the MFP article here:
http://www.modellmarine.de/phpwebsite/index.php?module=pagemaster&PAGE_user_op=view_page&PAGE_id=570&MMN_position=9:9
It’s a
german site, but there are a lot of pictures of the hull construction.