pe2dave
Established Member
Learning is never wasted surely. @DrDarren - good luck with your studying.I can understand the challenge of understanding the maths and physics and constructing accordingly.
However your project is the size of a fairly modest garden shed. Unlike other timber buildings where roof loads, winds pressure, first/second floors, loft access and use, internal fit out, etc are considerations, a bike store is mostly needed simply to keep the contents dry and secure.
At this level they are typically built as separate sides, 2 roof panels and floor. Frame is likely to be 50x75mm at a maximum (25x40 is common) with 10-15mm tongue and groove walls, floorboards and ~12mm OSB roof. Nails not screws dominate the structure!
If erected on a level base and maintained they will last 10+ years. You may find it cheaper to buy the shed rather than separately source the materials.
Sorry to be a bit negative. If the goal is a project you want to do - great. If the end result is just a cycle store - there are easier ways to achieve the end result.
Never know, you might learn enough to build your own (neighbours?) next house!
Please come back with your book list.