From what I can see, it looks like it was 'Car Innovations' that supplied the turbo manifold for the Jamsport Fiesta ST150 kit that is no longer for sale. Jamsport still appear to do Supercharger kits though. Two key pieces to a Fiesta XR4 turbo conversion that I wouldn't have the capability to develop something custom would be the Exhaust Manifold and the Intercooler. There are intercoolers for sale still that will bolt into the front of the fiesta. And there are a gazillion Duratech turbo manifolds that I can see for sale - but getting one that tucks the turbo down between the firewall and the engine as per the turbo build thread above looks to be a bit tricky. The rest is mainly intercooler and intake piping (aside from a custom dump pipe, depending on the best turbo to use for the 2.5).
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website is currently down - but they too look to be on
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Lukeyson