You have to have the saved DVD project, and the required uncompiled video and audio streams.
Having ripped the clips though, and with a proper DVD authoring tool (like DVD lab that MeBe mentioned) , you could reconstruct them.
There is also the option of using DVD remake pro, and deleting all the movie blocks, just to keep the menus. You could afterwards add another movie's blocks in their place, but you would have to edit the menu's commands as to re-direct to the movie blocks you have added. This is a very time-consuming and painfull proccess if you ask me...
The best solution would be to download the whole DVD and use it "as is" if you are not very experienced on that field.
So here's a list of the available OT DVD with menus you could search for and acquire:
Row47 7 disc set
Editdroid 3 disc set
Dr.Gonzo's 4 disc set
Isomix 3 disc set
Punk13 3 disc set
Look 3 disc set
Quality Broth 3 disc set
I think you could find this link helpfull.
There is also the Farsight ANH disc with menus I made for Rowman, so he is the only man you could acquire this disc from.
Edit:: PS. MeBeJedi, thanks a lot for the DVD lab prog suggestion. I have used it for something like a month now, and it is indeed an awsome prog.