Just wondering, if you are not going to have any fees, how are you going to profit from this?
(unless you get it from the transaction fees)
Well for the design it seems a little dull if you compare it to other sites. Get a colored and soothing background I guess, and also create a fancy logo and favicon.
Also trust is important, it needs to be built up, and it has to show that the investments are trustworthy if you want them.
For me I dont trade much, but it will be good to be able to give others 'Tips' or chat with them easily.
Nice plans, good luck for them! ^^
(StiB is Bits backwards \o/)