For us the real problem was the plane itself. We had a few test-vehicles made by the Czechs but we had to be capable of building our own. Some attempts were made, among them a bigger one with 80 kg of payload, this was also tested by a real pilot. But by the end we had to revert back to the Czech design.
When my source material was written, about 2005, the tests and development were still going on, with modern electrical equipment and all kinds of gadgets on board I can't bothered to research what are them in English. Also new motor was obtained since the old Czech one was retired, new, lighter materials were used for the skeleton, fuselage and wings too.