Okay, so 180cm = 70.866in = 5ft 10.866in. (1in = 2.54cm) for those of us who have trouble with conversions. Given those measurements, your minifigure is just over 1:43 scale (about 1:43.2 scale as calculated from this
website.) According to this matrix then, 1 meter ≈ 2.9 studs.
The Republic Gunship (7676) is listed as 17.4m long on Wookieepedia - not sure if it includes the guns, but I'll just assume it's the measurement of the airframe - which would be 50.46 studs in length, approximately. Just looking at the instructions online, I'd say the airframe is about 47 studs long, which would be really close - about a meter short. With the guns, it would be longer, of course. This is about a 6 or 7% difference in size given the 1:43.2 scale.
However, increasing incrementally to the 1:44 minifigure scale (a widely utilized scale), 1 meter ≈ 2.8 studs, and this makes the LEGO gunship's length about 48.72 studs, which is pretty spot on if you ask me. This is under a 5% difference, used commonly in statistics to verify significance, or in our case, I would argue accuracy. Given the wide ranging opinion on what "minifigure scale" is, I would say 7676, and anything close to within 5% (or even 10%) could
be considered minifig scale.
Without looking, I would say many of the starfighters would meet this criteria, however an AT-AT would have to be about twice as big as any LEGO has made up to this point to qualify for this scale.
Sources: (highly recommend visiting these sites for matters concerning scale)http://swooshable.com/minifigscaler/http://www.eurobricks.com/forum/index.php?showtopic=45451http://www.flickr.com/photos/gambort/2700119117/http://www.flickr.com/photos/gambort/4251981163/http://www.flickr.com/photos/gambort/5119311179/
Hope this helps!