Firstly, our opinions differ somewhat, but I would not particularly say the time these units went on sale were the best times for the market. Personal opinion of course. There has been a slump on the horison for a long time now.
No parking? Im sure the plans show allocated parking within the complex.
Once the units are physically completed, they will sell, to let or to buy, but im sure they will sell.

25% discount from original asking price, maybe a bit more, but certainly not a 75% discount as some have suggested.

With regards to the monies for the underpass. I think you will find that the agreement is that the underpass will not be touched until the platform 2 exit is completed.