We (and with "we" I mean CT|DND team and some of the open-source project developers and the beta testers) are working in order to have Mobup running *at least* on the Sonyericsson K750i (obviusly we already support a large slice of s60 devices and some Motorola devices).
What we're planning is to have an installer file which detects the platform on which Mobup is being installed and consecuently changes some variables (e.g. The image width and height).
Should anybody be interested in helping us on this particular topic just drop us a line and you'll receive the latest, not yet published, nightly build.