6g) Can I participate in a project run by a colleague of mine?

If you have planned the project together with a colleague and if you are responsible for a substantial share of the research work, you should participate as applicant. The project will then be yours as well. If your work will not make a substantial contribution to the project, and if you are not responsible for the project or the project idea to any significant degree, the role of project partner will be more suitable for you.