Will the source code of your site, when developed, be available for others to tinker with and look at?
Not quite sure about that. I would probably say no, but if there is a demand for it we might consider releasing it. It really depends on who codes it for us.
Well if you're interested in making the source code for this website open (I'd recommend the AGPLv3 license since it prevents source closure by 3rd party projects) I'll donate towards this project.