Patterns - I'll need to make a card model with individual panels to get sizing right. I use the same basic pattern for cutting fabric, assuming each panel has a 10mm or so wide tab to join /sew etc, right?
Eyelets for cord loops - if I buy these can I fit them with a small hammer or do they need a press? Any alternatives?

Foam lining for panels, (Evazote etc - alternatives?) - is it a real faff to include to give a boxy bag some shape? I guess I just need to double up on a panel cut-out and sandwich it, allowing for the thickness. A plastic sheet liner may be easier.
Edging for a lid or pocket top - double back the fabric along the edges, sew, fold edge material round, sew?
Webbing daisy chain like Alpkit use - does it need support from the back too if I'm hand-sewing to a strong but scruffy standard? : )
I'm ok with doing this the slow way by hand as it's more for trying an idea than durability and I don't own a sewing machine. A learning process really. Thanks for any tips, links etc.