Turn it into a scraper plane - that's what.
Here is a clever use of those remaining parts when the iron bench plane base was damaged beyond repair, or a cheap scraper plane was needed and made from a spare plane body and bits.
See:
RECORD Tools England Vintage 4-1/2 Scraper Hand Plane - eBay, Planes, Tools, Hardware, Locks, Collectables. (end time 07-Jun-10 19:30:54 AEST)
The ingenuity of woodies always amazes me.
SG