With this mod you can scale stack type parts to up to 1 kilometer in size and %-scaling parts to up to 25600% their original size using Tweakscale. Yes I know that is not actually unlimited but it is close enough for any practical purpose within KSP and the name just sounds better.
To install it just take the "GameData" Folder out of the downloaded ZIP file and insert it into: (your hard drive)\Program Files (x86)\Steam\steamapps\common\Kerbal Space Program
Dependencies -Tweakscale and all of its dependencies
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