Bigger jets for bigger planes. More Mk3 wings, or an overhaul. Inline plane/lander landing gear. Bigger solar panels for the new solar curve. At least bigger fixed panels, something approaching 2x the size of the OX-STAT. EVA struts and fuel lines. Would be a godsend. SRBs with some punch. The current ones are kind of wimpy. Of course, better fairings. Art overhaul, please!