i am able to create a main frame (unable to acces the option to disable resize?),
See Ace3 ticket 80 and ticket 214. There isn't such an option until one of the maintainers makes a decision about that patch; if you really want to disable resizing, it's trivial to make a custom container using a copy of the Frame or Window code as a starting point, then make changes as needed.
And while AceGUI isn't really intended for direct use (it was mostly meant as a glue between AceConfig and the UI widgets), it is entirely doable as long as you have a certain discipline and plenty of caffeine. I would recommend a different GUI wrapper toolkit, except there aren't any. IMHO it's still less annoying than futzing around with the Blizzard frame methods. If you're getting lost in the chain of resizing/refreshing calls, you may find it useful to add print() calls to the guts of one copy of AceGUI-3.0.lua, and bump its revision number to something ridonkulously large to ensure it's the copy being used.
I still think it was poorly-named, since at least once a month a novice AddOn author posts asking how to do things with it; the library is more suited for config options (and only if you're well-versed in its inner workings or know black magic) than a generic GUI.
I can indeed hope that this patch will be approved (or a solution is found for the preventing of floating sub-frames upon resizing) soon(tm).
For now, i have poored myself a big mug of coffee, and gonna take a look in the resize calls to make sure sub-frames are resized/repositioned correct. If all else fails, i will make a mainframe container using Blizzard's frame, and try to fill that with the ace3 framework - either way enough to do for me
well, i am messing with the usage of create(window) instead of create(frame) to use its setting to disable resizing, but this results in the no-show of the very frame that was floating away on the usage of create(frame), so i reckon that i indeed should dive deeper into the resize chain and see where exactly things go wrong...
not giving up on the framework just yet ^^
edit: using fixxed widths for the frames in the [BOTTOM] frame, and the issue is solved, using Relative width just doesnt seem to result in correct dimensions?