It's been a while since I designed the display stand for C-3PO (set 75398) and R2-D2 (set 75379). Since that time I made some changes, mainly to make it a bit smaller so that it fits better on my shelf and I also prepared an instruction. In total I used 480 parts which costs +-40€ (EU shipping). To get a list of parts not included in C-3PO set, use compare tool on rebrickable and then, export the part list to bricklink. It should reduce the costs to +-25€. Parts in white can be used in any...