I would be happy do make a texture pack for you which includes a 3D modelled cup... I would do this for a dollar per model and 50c per texture...

Hmmm. For the Legend of the Holy Grail,I recommend a similar starting point to the movie (or game). Try to make selection classes,and since it's an adventure map,try to use NBTEditor or MCEdit to give yourself unique mobs! That way,it's not boring to the point where you turn it off immediately. Also, try and make it as detailed as possible. Try to ask friends to help you! You can make a base perhaps? Besides,just make it look ruined and etc. If there is a "Bad Guy",then you may want to use someone's skin for the head. Try to make it a permanent skin (Safe Head) and use MCEdit,NBTEditor,or even WorldEdit for this. Basically in Summary is to make it Unique,use Shaders,Detail,and lots of Redstone

make a deadly rabbit :O and a very very very very long bridge!