[noun] + 型 [noun] + 型 + の + [noun]
型 after a noun means "type" or "model": the category, design or size class something belongs to. As a suffix it is read がた. The compound is a noun, so it takes の before another noun.
With おお大, なか中 and しょう小, 型 gives a size class. You hear these with vehicles, appliances, animals and storms.
Blood types are A型, B型, O型 and AB型, and "what's your blood type?" is なん何がた型ですか. The question comes up in small talk.
These go beyond "type" and "model".
After a letter or a shape, 型 means "-shaped".
On its own, 型 is read かた and means a mould or set form: かた型をとる取る, "to take a mould". In some Sino-Japanese words it is けい: てんけい典型, もけい模型.