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There’s an architects thread on here, maybe have a word in there, they might be able to point you in the right direction, or be willing to take it on themselves. Or speak to @Fox know he got some pretty work done, though thinking was speedier than your budget..
I also second @Chalfie, get the professionals in to do the heavy lifting (knowledge courtesy of shit loads of over spends on grand designs)
@Sam_w I have had an offer accepted on a house and need to add the middle class conservatory etc. I imagine its about the same size as your tool shed, or possible the helps quarters, but we will just have to make do (slightly counting chickens as there is plenty of time the whole deal to fall apart as we need to sell our flat).
@lardy I haven't really, a couple of friends have and I feel they will be able to lend some invaluable advice. I have pretty much been planning this for about 10 years so have concepts and sketches done but liked the idea of a professional with their bag of tricks, but maybe budget wont stretch.