Adding in a bay window

A little bit of extra luxury in the main bedroom
And another last minute change of plans
We are thinking about putting in a small cantilevered bay window to accept the new Rylock window.
The initial thought we just gave to the builder is to sister in floor joists in 90*45 F-17 LVL as we are only going to go 450mm to the eaves dimension
Just a small rectangular box and somewhere to sit to get dressed with a blanket box underneath a seat
Can anybody see a problem with designing and framing this up?
A good days labour for a chippie plus apprentice?


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