How to build a really SOLID shed

How to build an awesome shed AND for less than you can buy them for, also this is way more solid, it’s insulated, is the exact dimensions you want and you can put the doors and windows (if any) where you like. My main shed where all the other stuff is filmed was built in the same way and has been up for 7 years with no problems at all, now i went a bit fancie on the slate roof but you only live once haha. There are no drawings for this as you make it to the sizes you wish. Now i’m not a shed building chann