Systems of bars in x with intermediate hinge, also called SLE (scissor like elements), are suitable for the adaptability approach from the perspective of structural mobility. They are the starting point for new solutions: transformable M-SLE. It has been proved possible to obtain different formal alternatives with a single structural solution, by making modifications to add a DOF (degree of freedom) to the SLE base unit. In this research a new transformable typology is studied: telescopic bars, articulated in x. This proposal, based on the new MP-SLE (modified prismatic SLE) typology, combines two mechanisms of transformation: the scissor system with telescopic bars. It should be able to offer a wide variety of shapes without changing the span to cover, and unlike foldable structures, with only two stable positions, the new proposal offers several intermediate configurations. The object of study is a deck arch formed by several SLE units with 4 telescopic bars driven by pneumatic actuators. Through kinematic analysis (study of mobility), geometrical analysis (search for possible configurations and limits) and structural analysis (resistant feasibility) of the proposal with the new MP-SLE transformable unit, its critical issues of dimensioning and construction have been identified. This enables announcing possible solutions and defining future lines of research.