Loved building this chair. Super simple to put together and very sturdy once everything came together.
I modified it to create a larger and taller chair, using 2x6 and 2x4 lumber. Because of this change I felt like my math challenged brain was completing some sort of quiz, but to keep things simple I cut the pieces step by step recalculating lengths as I went.
I marked up the plan as I went, so if anyone is interested just let me know & I'll add the changes.