Building a Cabin Shed with No Experience - Part Two: Building Foundation and Wooden Base

Hi Everyone! In this video I build the foundation and wooden base that my cabin shed will be on. I'm sorry that the video quality is poor in some parts, I had bought a new camera that turned out to be pretty bad so a lot of the footage wasn't able to be used at all.
List of parts used for making the foundation and base:
Foundation stones: 7.3N Dense block
wickes.co.uk/Tarmac-Standard-7-3N-Dense-Block---100mm/p/166859
Wood: CLS Studwork Timber 38x63mm
wickes.co.uk/Wickes-Studwork-CLS-Timber---38-x-63-x-2400mm/p/107177
wickes.co.uk/Wickes-Studwork-CLS-Timber---38-x-63-x-3000mm/p/145305
OSB3 Sheet
wickes.co.uk/General-Purpose-OSB-3-Sheet---18-x-1220-x-2440mm/p/110517
Screws: Exterior & Decking screws
wickes.co.uk/Wickes-Decking-Screws-4-x-65mm---Pack-of-200/p/510071
wickes.co.uk/Wickes-Exterior-Grade-Green-Screws---5-x-75mm---Pack-of-500/p/287698
Wood treatment: Cuprinol Garden Shades
cuprinol.co.uk