This document describes the hardware proof of concept system developed for the ODISSEE project, based on primarily European digital IP. The goal of the hardware proof of concept is to demonstrate the ability to both design and utilise a cost-effective and suitable hardware system for both radio astronomy and high-energy physics applications that is both fit for purpose and efficient compared to the current state of the art. In this document we present the technical design and description of the proof-of-concept hardware for the ODISSEE project. In addition the the above mentioned experimental components based on European digital IP, this document details the small-scale experimental compute resources available through partner infrastructures, including those hosted through SLICES-RI, SLICES-FR, Surf and CERN. Finally scale-out pre-exascale and exascale resources available through the project are also mentioned. This document is written early on in the project, and therefore describes a concept rather than a fully finalized prototype. Furthermore, this document describes some of the advanced state-of-the art systems available in the project that can be used as a baseline to compare our solution against. Since one of the key performance indicators defined for this project is sustainability, we also describe the ways we can measure consumed energy for a particular infrastructure, system, component or application.