Anything is possible, but whatever you do i think you need an expert on Mendix development for any first attempt at Mendix in an organisation that is unfamiliar with Mendix. If one is not available to you, check out the mendix partner-section of this website, there are many available.
Evaluation and implementation of an LDAP from scratch is very ambitious in a six weeks time scale. Although LDAP is not technically very complex, the organisational impact can be significant and need implementation time. Maybe start without ldap?
I’d say the learning curve is pretty steep and you can see results quickly. however, I highly recommend looking into the Mendix learning paths as well as the dev-best-practices . The Mendix community is pretty active and – especially if you know what exactly you are going for – delivers great solutions here in the forum.
Are you looking for an experienced Mendix developer to help out and kickstart your project and future development?