Hi Chandra,
Schedule of Materials - usually the colour chips which come from the brick and roof tile companies, paint colour chips if part of the building is going to be rendered, colour of garage door, window trim, fascia, guttering etc (all should be available from suppliers) - don't just list the colours you need to SHOW them as the names of colours sometimes do not really indicate the actualy colour (eg what colour is dulux 'Enchantress'??) Cut out all the colours and assemble them onto a sheet of paper and then label them (ie part of house, name of colour, sample) It helps to have a copy of the front facade on this sheet and give each part of the facade a Symbol (eg A, B etc) and match these to your list.
You won't have any problems getting your permit - Glen Eira are great (and adaptable) Councils know that if they knock back a development that is then taken to VCAT chances are VCAT will approve it (due to the extreme shortage of housing) and it costs the council money to go to VCAT.
Two 2-storeys on a corner is not a problem, as the townhouse in the "rear" does not usually overlook the back yard of the neighbouring property (it will overlook the front yard of the neighbour).
One thing you might want to think about is street addresses - eg if your property is 100 This Street on the corner of That Street, call the unit which faces This Street '100 This Street', and call the unit which faces the side street 2A or 1A or whatever is appropriate in That Street. This way the people who eventually live in the rear unit do not have to continually explain to everyone who comes to visit or deliver something "we are not actually on That Street we are round the corner in This Street"
The 4 metre from the rear boundary rule is not an issue because you have to have POS anyway. In a corner situation, for the rear unit, you can use 4 metres from the rear of the property (and therefore your POS is down the side of the rear unit - this is useful if there is an easement along the rear boundary), or 4 metres from the rear of the unit, they will accept either. You probably want to maximise sunlight into the rear courtyards.
One thing nobody tells you is that you WILL require a landscape design - this will be a condition of the Planning Permit when it is granted. You will also need to actually do the landscaping for both units before you will be given a Certificate of Occupancy. I can recommend
www.outerspaces.com.au for this - they specialise in designs for unit developments and are in Bentleigh. You will be required to plant at least 2 semi-mature trees (2m height) for each unit (one in the back, one in the front)
From my experience doing developments the planning and design costs involved are minimal when you consider the building costs ($10k compared to $600k plus for two units) I would not skimp on design and planning - better to get it right the first time than to have to make amendments to your Planning or Building Permits because you later realise something is not right. Show your designs to as many people as possible and ask for their constructive criticism before you submit the plans to council.
Another issue KateMelb brought up is also misleading - it is not 50% site cover for each unit it is 50% OVERALL site cover (and much of the 50% not covered is the 7.5 m setback you require - POS and required setbacks will be the limiting factor on the size of your buildings, not the 50% rule!)
And if it is any consolation - it took me 7 weeks to get my last permit through Glen Eira (although it took them another week to actually stamp and send them!!) - a fantastic effort from my point of view...now if only the builders would get their act together! Hopefully finished within the month, but I would have liked sales to be in Autumn not Winter!
Good Luck with your development!