This was originally meant to become UpgradesGUI Continued, but for several reasons starting "from scratch" proved more practical, and this Add-On inherited only a little from the former by @Gotmachine. For now it remains more limited than UpgradesGUI in certain ways. This plugin works in the VAB or SPH and adds a button to the right-click menu on any parts with upgrades to expand their applications and allow for implementing upgrades as alternatives which can be chosen at any time, regardle