No worries vladaruz, sorry i couldnt be of more help - I hope this thread gets filled with all the Japanese local shopping secrets too - i'd love to know where the best deals are to be found.
If you do make it to Ebisu - the map i used to find mr. craft was this one
http://www.mrcraft.co.jp/map.htm - it is relatively easy to find as far as shops in Tokyo go - good luck and happy model hunting.
Me.
PS - I agree too much Gundam and not enuff automotive models...It may be easier to stop being a car nut and start being a gundam nut (Bandai do make some amazing Gundam Models)!!