Somebody has to take-on the clown that you have elected as E/C Secretary, and I guess you’re trying to decide if that should be you!
As I see it, your current problem may be that even though the proposed renovations are entirely within your lot, some may be on common walls, you are making changes to the “services” within your lot and the SCMA requires you to give your O/C a minimum 14 days notice of that, your contractors will necessarily be on the Common Property and your O/C may have requirements with regard to that, and there will be unavoidable noise that both the O/C and your neighbours may regard as a nuisance.
So with all that and the information provided in your previous posts taken into account, as tempting as it is I’d be pushing the project back until you’re absolutely sure that all the boxes have been ticked; but that’s me!
Perhaps talk to the neighbours, and if they’re on-side and you can be sure that your Contractors will behave themselves by not leaving vehicles, tools, and materials on the Common Property, then tell (not ask) the E/C Secretary that if you don’t receive a definitive yay or nay within the (required) 14 days from the date of your original correspondence, then your works will commence.