Thanks for viewing! I am part of the team that develops International Online Soccer: Source (www.iosoccer.com). We are looking for an experienced mapper to join the team that would be able to produce some stadiums for us. We are approaching the end of the development process for our new release, but we have recently celebrated our 10th birthday as a mod (originally on the GoldSrc engine), so we know about longevity, and your work would be guaranteed to be in our public release in early-to-mid 2014.
We have a pitch template for you to base any stadium from, which hopefully will make your job slightly easier.
If you're interested in helping us out, we would love to hear from you! This work would be unpaid, but we hope that the guarantee that your work would get seen and used in a public release would inspire you to help us out. If you've got any questions or would like to help, contact me on firstname.lastname@example.org.
Thanks for reading, and I hope to hear from some of you!