Gather ideas and inspirations. Background study
Few of the specific sources I am using for inspiration, design ideas
to look at different styles, frames and finishes various DIYers used
for validating dimensions and getting idea of hardware needed. Pretty useful.
for more frame design considerations
The fishandtips design is more conservative than garf and suggests more structural and joint strength.
Of course there are many many more but these are a few that can provide or lead to all around aspects. Besides a few more that is my initial set of inspirations