I think you can buy large maps like that on the internet. You can't really make one yourself, as it will be so low quality that if won't really serve your purpose. There are map stores in some cities in which you can buy giant maps of any area you want, that they print and/or encase in laminate. Check on-line.
I really like giant maps because they allow you to have one spot to strategize and mark your locations. I've been using them for 30 years.