The biggest problem for all PI is a casing.
On sale there is many casing, but they are made of acryle and only the specific PI model enters them.
I suggest to think of development of the universal PI case, with integral unit of a supply, the built-in modular expansion board including CMOS, USB-HUB and remaining necessary connectors and fixings for modules.
Also in advance to provide holes and windows for analog regulators and LCD panels.
To make the case with good design, like Hi-Fi of the casing.
To make the case in 2 options - metal and plastic.
If the project is interesting, it can be realized through Kickstarter.
It would be desirable to learn a judgement of remaining.
On sale there is many casing, but they are made of acryle and only the specific PI model enters them.
I suggest to think of development of the universal PI case, with integral unit of a supply, the built-in modular expansion board including CMOS, USB-HUB and remaining necessary connectors and fixings for modules.
Also in advance to provide holes and windows for analog regulators and LCD panels.
To make the case with good design, like Hi-Fi of the casing.
To make the case in 2 options - metal and plastic.
If the project is interesting, it can be realized through Kickstarter.
It would be desirable to learn a judgement of remaining.
It Crowd... 
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I would like to buy one that is not the same transparent acrylic... someone with equipment of 3d printing could use this opportunity to do good money and help everyone in the Opi community