The board is hosted at the Turrican SETA Turrican-Fanpage, donīt forget to visit ;)
Re: How do I play levels just using the editer?
You can now use the new T Starter 2.2 with included Mono -> http://static.turricanforever.de/download/Tools/T%20Starter%202.2%20(plus%20Mono%20&%207-Zip).zip
Please read the readme.txt