A noble idea. Bute the download of the offline maps takes forever (like 4h for Singapore and I have the best of equipment ;-)) ). And it looks as if the change the font-zoom always one layer too big. Just as text becomes clear it changes to the next zoom level and is fuzzy again.
All these things are solvable by an update.
But if you have plenty of time at your hands or use this app online, it really is good piece of work.
SchmuliAliasSam about Singapore Maps, v4.0.5