Hi Gasman ..
My boxes are maybe about 10x8x2" High ( when shut )..
Foam in top & bottom sections ... ( I like foam myself, not everyone does.. some prefer the little metallic hook-clips )
One of my boxes is a 'double sided thing' .. two lids if you like..
As far as the construction goes... in the words of Humphrey Littleton... 'Im sorry, I havent a clue'
... i just 'turn' ... I'm nowhere near clever enough to do 'real' woodwork ! :wink:
As Lurker says... some fellas like a 'transportable box' ... especially if they're 'confirmed float tubers' ( Bellyboats ), that like to paddle out in whats not much more than a big innertube, and float about in that all day... ( I prefer being in a boat ! ).. and the same goes for habitual 'waders' that spend their fishing time waddling out into the loch or river ... for those guys, light, portable & fishing waistcoat pocket sized carrying boxes are what they need .. as Lurker says.. they'll tend to 'tackle up' at the car.. fill their pockets with the essentials and off they go. ... filling up 'from' their main flybox, for the day. -- often stackin flies into a lambswool patch on the jacket or waistcoat etc.. ( which is where
your box comes in, I guess )
If your man is more of a 'boat based fisher' or tends to fish more from a well-tended bank ( as at many fisheries )... then he has more scope to actually take his box with him at all times during the day.
A bit will depend on whether you want to give him a 'practical, useable box' or if your intention was more of a 'presentation box' which may never leave the home.
( This is somewhat akin to 'priests' .. the sticks with which to despatch the fish to a better place ... presentation ones are generally almost works of art.. lovely things... but the fish would almost need to salute you before you bludgeon it to death. - 'practical' ones tend to be a bit more like minature baseball bats.. or old hammer shafts etc etc.. you know the 'thinking' here , I'm sure !
)
So.. I guess ... much will depend on whether its a beautiful presentation box ... or a place the fella will actually keep his 'working' flies and be 'useable' ... one 'can' be all things to all fishermen... generally speaking , most fly anglers use a much smaller volume of tackle than your average 'coarse / carp angler' ... and usually carry one bag ( satchell size thing ) over the shoulder. so the box , if its to be practical,.. needs to fit in one of them.
Have a look at 'Fly Fishing Bags' on fleabay and the like.. you'll get the idea of size of the average bag's capacity...
and then maybe you'll know how to best go forward, and gauge the size of the box for your project.
Sounds a lovely idea, by the way !
And thats a new bit of info to me about the cedar... cheers Lurker ! didn't know that !
I believe there's a few fishers on here, hovering about...
so a few lads's input may be really helpful in getting you to a decision on how to best go.
All the best... box sounds a great idea though !!