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Structural design and sign-off needed for a Bay Window

Hi, We have a bay window (photo attached) which is currently suspended and we suspect it may be propped against the brick cladding that goes around our garage (not 100% sure on this). We are aware this current "design" is not covered by NZS3604. The aluminum joinery has moved quite a bit over the past 20-30 years it has been up and we would like to replace the whole window with a similar window but double glazed. We understand it may involve installing new joists from underneath (our garage) and cantilever them out to support the weight of the new window. We are after a quote from a Chartered Structural Engineer for the design and sign-off (PS1) for a complying system our builder can undertake. We are looking forward to hearing from you. Thanks in advance for your response. Claire and Alex