the unassuming , rock-solid technician went by celekar only and made no show of himself , but it became clear to the newest engineers as it had to the old that celekar was a brilliant technician , with a superbly dexterous hand in operating the various spacecraft machinery ; celekar had personally constructed a large portion of the selesta hull and most of the newly designed central crews quarters , and had coordinated much of the weapons integration into the hull , as well as the much of the complex wiring in the completed sections thus far .