Grayscale height maps for city project

[happyyasu09]

Hi everyone
Idk if i can ask a grayscale height map, but i'll try
Project Scope:
A map for a city which will be built in a Sims Create a World tool. It is second attempt, first one abandoned on 92% rate after constructing skyscrapers in city center which made whole map look flat (my bad)
This city will be uploaded for players, and will be free of charge.

Tech Description of Map:
Map have actual size: 2048x2048 (it have other sizes, but i need the largest one)
Grayscale 16 bit (program restriction)
Mountains on both side of the map is "distant terrain" restriction.

Idea
A city placed on two parts of land, divided by a bay (which have actual width size, restricted by bridge).
"A" part - small and hilly, hills continue to grow and become mountains (the end of map on one side), 1\3 of whole map, i suppose. Rural\Community houses will be placed here, also need some kind of plains for farm\estate houses. Would be great to have the observation hill (with flat cape), from which could be whole city viewed.
"B" part - 2\3 of whole map, more flat areas, microbays, harbor (this one should be like totally flat and drawn in rough straight\45* lines), a place for a beach would be awesome (if it will be long it will be totally nice ) the city itself should stand above the shore, so it will match the height of the "a" part, the outskirts of the second part should also be hilly and become mountains.
The style of the city is mix-match of urban Tokyo and historical Kyoto. So the B part is urban (maybe terraced city?), A part is historical. Also it would be great to have one special island standing in the bay for the replica of "hot-bath" seen in "SEN TO CHIHIRO NO KAMIKAKUSHI", due to the building restriction island should have a flat top 64x64 size.

Time
Idk how long it takes to create an idea, than converse it to actual grayscale map, so no strict limit, but maybe before new year

Copyright
Artist have all the rights, me have a right to use it in my city, and upload for free on one major sims 3 fan site, artist will be mentioned of course. Actually: on this.

Some pictures
pic1 - actually base idea
pic2 - really nice beach smoothing

Thanks in advance! Really hope anyone could give it a try ^_^

P.S.
nebovcvetochek (at) gmail (dot) com