Project: Bin the Conservatory

[PeterTweeter]

Hi BuildHub (especially the timber framers).

As it says, replacing the horrible conservatory that "(dis)graces" the rear gable end of our Victorian home is our next project.
With over 50 years experience of house building and refurbs, we are finding this project problematic.
All of these previous projects have been self-build, quite literally, with no involvement of professionals, ie architects & structural engineers - unless we consider my BIL - but let's not go there!
The project is the removal of said conservatory and 'dropping' a nice timber-frame garden room in it's place. Simple, I thought, but though we have a good vision of this building we now need to work with an architect/designer to realise/enhance/improve our vision & detail the design.
We don't know any architects and a stab at MyBuilder.com got lacklustre results. The next move is to put the project to Design for Me and see what occurs.
So, my fellow self builders, can anyone offer any leads or advice as to how we secure this expertise

BTW
The space is W5.5mxD4.3m across a gable wall. Windows above limit the roof options, so the vision is:
- a 2/10 transverse,monopitch roof, with standing seam zinc roofing (budget permitting); siberian larch cladding; floor to roof facade windows (in part); clerestory lights above and NO bifold.
We know, very George Clarke/Kevin McCloud - but we have to start somewhere!

Concerns:
1) Due to windows above, the roof needs to be as thin as possible & the ideal pitch is 2.5/10 (ie quarter pitch). I'm getting to grips w. moisture/ventilation & I'm taken by a US approach to fully seal the the space & sealing joints, etc w.PU foam.
2) Back in the day, framing was 4x2 studs; 50mm fibreglass; 1/2in ply sheathing & building(breather) paper! I'm leaning towards keeping it simple @ 140mm studs & appropriate(?) insulation. Bearing in mind this is an addition to an inherently leakig victorian structure, I can't see the need to get any more sophisticated.
3) Connecting the frame to existing brick? I've read threads re. differential settlement, but I don't think this is an issue. My inclination is to, somehow, connect by gasket/mastic. Any thoughts.
Thanks for reading down to here, all contributions appreciated.

[Russell griffiths]

Pictures. 

[PeterTweeter]

Russel, not sure what you're expecting - but this, kind of, represents our thinking - very blue sky!

Cheers

 

[Russell griffiths]

No I meant with a camera ??

[PeterW]

13 hours ago, PeterTweeter said:

Back in the day, framing was 4x2 studs; 50mm fibreglass; 1/2in ply sheathing & building(breather) paper! I'm leaning towards keeping it simple @ 140mm studs & appropriate(?) insulation. Bearing in mind this is an addition to an inherently leakig victorian structure, I can't see the need to get any more sophisticated.

Welcome...!

 

So that won’t pass muster now with building regulations (and you will need them) so you’ll need to properly insulate to modern standard along with meeting the structural requirements of the regs too. 
 

With zinc roof etc, I would be budgeting £1700-2000/sqm all in - you will not be getting much change from that I expect.