Out of curiosity, I built the items 'Chaingun' and 'Autocannon Module', costing 0 credits. I quickly realized the UGVs (HWP-equivalent?) aren't implemented yet and the items cannot be used. But since the items don't show up anywhere in the sell screen, they are impossible to get rid of and now permanently take up valuable storage space in my base.
Maybe these items could be reclassified to show up under "Other" or something, until UGVs are implemented for real?