All sounds good to meI love inverted boxpleat. Would suggest you stick with pleats for your main curtains but try not to get too busy with the sheers and keep them plain if possible. Examples of what you are thinking about would hel;p

I had a similar situation replacing a thin porch roof, the down pipes that spoilt the simple lines that the posts and flat roof had, basically down pipes just looked just looked heavy and ugly. I fitted the gutters in level as these are short anyway and don't need a fall, but left off the spouting. Then by suspending a heavy* galvanized chain from the centre of the outlet down into large buckets set into the ground, which is filled with rocks or small lumps of concrete, the water will trickle down the chain. (that is a thicker gauge, not heavy* weight). You might also want to anchor the bottom of each chain onto a lump of concrete. You don't have to anchor the bottom, but you don't want anyone to be encouraged to swing on them. Obviously you won't see the buckets, but do need something to capture the water that runs down the chain. Small holes in the buckets allow water to run out gradually. The chains will hang down straight under there own weight, the look is more 'elegant'. If you get so much rain blowing off the chain that it blows onto the posts or house, it's very likely you won't be standing outside, unless you like getting soaked.

I'm glad you guys are growing.

An entire wall of built-in cabinets and hooks and cubbies for your crafting stuff (and perhaps filing-type stuff and printer for the office). Take a good look at what you have and think about how best to organize and store it and what could be displayed to be pretty and what should be hidden behind curtains or doors. A fold down ironing board on a wall or back of a door somewhere would be great. A nice desk and filing cabinet for the office side... or perhaps a great big table in the middle under the window, wide enough to function for both of you facing each other? A nice curtain rod would make a big difference too. Preferably just about floor to ceiling. I'd put a splash of colour on the walls and keep the curtains simple, but you could go vice-versa too. Something like this: [https://www.houzz.co.nz/photos/modern-bungalow-phvw-vp~4999540[(https://www.houzz.co.nz/photos/modern-bungalow-phvw-vp~4999540)