Now that we have our design almost set, let's look for the other parts:

• Frame: metal tubing. Will probably buy this off my local provider
• Wheels: @Frédéric Druppel received the rear wheels. I may have a wheelbarrow wheel that may just do the trick for the front.
• Bearings: Just ordered two 20mm bearings with pillow blocks. Will need another for the engine
• Sprockets/chains: not ordered yet, we may try to go into scrapyards
• Brakes: A disk brake+caliper has been ordered , bought one of those chinesium brakes for 10 european pesos
• Steel/Aluminium(/PVC?) stock. Might get some scraps off my college, worst case I can buy some from my provider, again.
• Seat: I may still have something laying around...

That's all for now!