Hi Ian,
Understand you are looking at various EC sales from developers, I'm involved with all the EC projects that you have mentioned, but unfortunately Twin Waterfalls is fully sold. For ecopolitan, only 3BR dual key units left (requires 2 generation family nucleus).
For Bellewoods and Forestville, there are still available units but Forestville limited left. The cost of a 3BR is about 800k, hence breakdown as follows:
 Cash 5%
 Cpf 15%
 Max bank loan 80%
 Stamp duties and legal approx 3%
Yes CPF can be used to service the monthly mortgage.
Please note that there are various measures you have to adhere to before you can qualify for ECs, namely:
 Gross household income monthly cannot exceed 14k
 No overseas or local private properties currently, or cannot have been holding ownership in the last 30months. 
 Have at least 1SC in the application
EC loan is also subjected to 30% MSR, and your max bank loan depends on your age, income and credit profile and any outstanding loan at the moment.
Thanks and may I understand your requirements further so to value-add better to your plans? Let's discuss further.
Warm Regards,
 Ivan Ng ERA ASAP 
 (ASk Anything Property)
 Proactive. Sincerity. Feedback.
 SMU BBM (Finance), Magna Cum Laude
Email: Ivanng10@gmail.com
 Contact: 
(+65) 97432395 
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