Just an opinion here, but I feel that the map is overpowered by all of the other menu bars.
Scale down side bars to make more room for the actual map making?
-scalable so the user can adjust it to their liking?
Narrow down the asset list to 2 columns? Yes this makes the scroll list longer but you have more room to work with the map.
Scale the asset images down and give the thumbnails a mouseover to enlarge a preview?
Nice work so far. Keep it up!