Frap Tools complements the modular concept with its Plus-Modular-Case-series and offers a compact case which can be extended by any number of units. A "boat" offers 42 TE space for modules and can be completed with separately available wooden side panels. Screws, washers and connection pins for connection to other Plus Modular Cases are included. The Plus Modular Case 4 contains four housings that can be compactly assembled to 2x84 TE or 1x 168 TE, for example.