At last - some official news about the finish of the beach regeneration:https://www.ondafuerteventura.es/costas-confirma-al-cabildo-la-playa-castillo-estara-abierta-banistas-usuarios-del-verano/
A Google translation:
The Canary Islands Demarcation of Costas has confirmed today to the Cabildo of Fuerteventura that the rehabilitation works of the beach of El Castillo will end on the 31st of this month and will be available to users and swimmers before this summer. The announcement was made during the meeting of the Commission for Monitoring and Control of the Agreement of collaboration between the State and the Island Corporation for the implementation of the rehabilitation project of this beach in the municipality of Antigua.
The meeting was attended by the president of the Cabildo, Marcial Morales, the head of the Canarian Demarcation of the Canaries, Rafael Francisco López Orive, the mayor of Antigua, Juan José Cazorla, and the Minister of Public Works, Edilia Pérez, among others.
The Cabildo of Fuerteventura, for its part, has demanded the optimum completion of the different works units before finalizing the contract with the awarded company and the corresponding agreement with the State.
Likewise, during the meeting it was agreed to start as soon as possible the technical and administrative work necessary to reinvest the reduction of the award of the rehabilitation works on the beach in the extension and improvement of the annexed avenue, as agreed last year.
On 20 April 2015, the Cabildo of Fuerteventura signed a collaboration agreement with the Ministry of Agriculture, Food and Environment for the execution of the construction work on El Castillo beach in Caleta de Fuste. The island corporation contributed 1,881,186.56 euros and the works were awarded for 1,966,059 euros.