Well, I don't really know enough to make many suggestions.. How about if I mention what i'd change if I were to do my instal over again?
First, I'd make the hopper larger. I'd make it good for at least a month,, and I'd make the roof so that I could winch a section up, and load the hopper with my front-end loader.. Even though I like the exercise of loading the hopper weekly, there are times I really wish I didn't have to do it weekly.
I'd make more of an effort to improve the insulation package and burried trench for the pipes from the boiler building to the house and shop.. I'd foam the bottom of the trench, lay in the insulated and sealed pex-pipe package, then foam the sides and top, then add a 4' wide plastic layer like a long umbrella over the trench, then backfill. Even though i have a VERY good insulated pipe package, there is a slight, constant heat loss to the ground, which is worse when the ground is damp/wet from rain/snowmelt etc.
Keeping the ground around the burried pipes dry would reduce heat loss, the ground is an insulator if it is DRY, but not if it's damp or wet.
I used the outdoor building i had, I should re-roof it, and insulat the building, it's got a greenhouse roof, wth no insulation. so i'm sure i'm losing some heat to the building, expecially last year when we had several weeks of sub-zero weather. This year it's probably minimal.
I'd consider raising the boiler on a base, and figure out an ash-removal auger, so it dumps into a large, tractor-handled ash pan,, this way I'd not have to go out to the shed but every 4-6 days or so.
That 's what I can think of right now. for me it's all about minimal handling of the coal and ash.. I've got too much on my daily/weekly 'list' as it is, and thankfully the AA only requires a visit about 3 times a week, one that lasts about 20-40 minutes when I load the hopper.