So we need additional blocks for the Multiblocks:

• basic blocks without function (maybe basic and advanced)
• cooling block (for air/fluid cooling), replace fire rate upgrade, also vents (as attachment)
• power converter block, replace efficiency upgrade
• targeting systems, replace accuracy/range upgrades
• ammo compressor block, replace scattershot upgrade
• energy generating blocks

details:
Energy Gen: need to rewrite energy generation in bases, add utility to get fuel item from slots