emporis 50' metal boat

my father used to have the prints for this boat and someone stole them from him years ago, now we want to build it, and i havent been able to find where the plans were from, hears the details of what i know

- 50' metal design
- can be beached when the tide goes out for emergency engine repairs
- was designed skim the coastlines for best fuel longtivity
- has spiral stair cases
- simple design for a average builder
- single engine design with top speed of around 10 kts
- motor yacht design

any info would be great