Really, Really big maps.

Ok i know it is possible to make a 480x480 map. I am in possession of one that some1 made for me useins zepirs map editor. My question is can i make the map have that many squares, in a different, elongated shape? Basically i want to make a map that is in the ball park of 350x650, a few less squares in total than a 480x480 map, but more usefull to me, because map design i wanna make is eliptical.
i guess ill go download zepirs map editor and try this, but it would also be nice to know if its possible.

oh by the way YES i know that blight will not work. Yes i know that i will probably run over doodad limit. I hope i will not encounter this problem because much of map is water. I do not want any practical issues addressed here, just a yes or no it is possible, and a map doing it if ur feeling nice

Use UMSWE. Its very good editor and it can make map sizes epic (thats so big you will need like couple of hours). Here, heres the latest version I have so far.

By the way, what is the reason to have such a big map?, in multiplayer it will lag, and if it is for single player you could link two maps instead of making 2 maps

Lord Vexorian. i said NOT TO INCLUDE THAT SH-IT i told u i know all of these issues. I will NOT disclose what i am doing at this point in time, but let it suffice to say i know enough to make sure it will work lol. also for those of u interested in this stuff, no its not possible :/ i just had to scale down to 480 width, oh well, i can manage still plenty of room.