I found a few threads about sports jacket conversions while researching my own project and here are the links.

Farlander's thread, "Converting a tweed sport coat to a Crail jacket"
http://www.xmarksthescot.com/forum/c....html?p=496170

David Dalglish's thread on the curved front at this link.
http://www.xmarksthescot.com/forum/j...x.html?t=22201

Here are some good threads by Alan H

http://www.xmarksthescot.com/forum/s...x.html?t=21573

http://www.xmarksthescot.com/forum/m...x.html?t=14252

There are many many more I'm sure, but that aught to get you started.