Construction Industry Scheme & Modular Pontoon Installation

I have a new client who imports modular pontoons and installs them. These are mostly of a temporary nature for a particlar sailing event but they can be of a more permanent nature. Being modular, all can be taken apart and rebuilt elsewhere.

The client occassionaly uses subcontractors in the UK - does this fall under the Construction Industry Scheme (I have had a look at HMRC guidence but cannot find anything specific)?

Many thanks