IN ROBLOX: I need something big to make, something huge, something epic, something people will remember me for?

In the computer game ROBLOX: I need something big to make, something huge, something epic, something people will remember me for... but what? I've made HQ's, weapons, obstacle courses, an.. lol... X-101st/LordVade torture model.... Tanks, jeeps, helicopters... i've made so much! But I need something that'll take the cake... I need an epic great sweet cool model.... anyone have any ideas?