Well mate, you made your first mistake by buying a Die-Cast model. Bad move.
If you want good Snap-Fit models go for Long Prosper 1/200 or the slightley smaller 1/250 scale. To give you an example of the size i'm talking about here, these are the sizes of a 1/200 B747-400 in Long Prosper:
These measurements are based on a Cathay Pacific B747-400
But if you have the money and want a top quality model go for the Pacific Miniatures 1/100 scale.
I recentley brought a BA747-436 1/100 model and it's fantastic. I highley recomend it.
Good luck with your model collection.