Progress craft
Is it not possible to say park up the progress's crafts and take bits from them like the solar panels etc... and slowley recycle them. even redesign them to be easier to do this with.
can,t the storage bit be design to allow rear docking so only the engine burns up and then you slowley build up long tube structures. not nessary air tight but at least a remote walk way or an air that could become airtight with a liner say for water.