This parts pack add-on is an assortment of vaguely stock-alike parts, most requiring no additional texture memory (they mostly have unique models, but reuse stock part textures to save memory and achieve a stock-alike look). I've been adding my own parts to the game for about a year, filling in holes needing to be filled but either weren't filled by other mods, or the other mods weren't stock-like, or required more memory. For Kerbal Space Program.