Well, I can pretty much assure you that I can design things that will stand,
but as for getting the literal most bang for your buck, thats not me because i use general principles rather than math to accomplish that.
Material choices is something i am pretty good with.
And building process i can certainly give you...
cost and regulations are not my thing too much.
What you really get with me is cheap (i work for free) high grade concept art theoretically good enough to build with but still probably best to hand to a real architecture team.
Its close enough that only other architects would generally be able to poke holes in it.
So if you generate a top and side view, give me the measurements for how long and wide and tall, and then a verbal description of it, I can probably
give you something which you can at least show around.
If you have the money to spend, then the thing to do is to have me design for you until we have something you really like, and then take that design to a licensed architect and have them do the math and etc.