ぐらいのものだ => Only A N1
(Not)only , (Not) even
ぐるみ => All of A, the entire A N1
Degree/ Level/Amount
くらいだ/ぐらいだ => Around/about N5
Amount
くらいだ/ぐらいだ => So A, to the extent A, A non-exact amount A, Around/about A, At least A N3
Degree. Level, Amount