Constitutional practicability of referendum on EU Constitution

Yes. Binding referendum provided if amendment of fundamental principles of the constitution effected but Art. 6 EU Treaty guarantees integracy of these principles. Consultative referendum can anyhow be held if ordered by ad-hoc-law.

Regulation about a special transfer of sovereignty to EU

none

Approval of transfer of sovereignty without effect of constitutional amendment

No constitutional regulation.

Approval of transfer of sovereignty with effect of constitutional amendment

Not expressly regulated, but constitutional amendment required.

Approval of constitutional amendment

Majority of 2/3 from members of parliament, amendment of fundamental priciples by referendum, Art. 66 ConstMalta.

Other constitutional regulations about referendums

none