In 1988, Concept Coach Builders of Milwaukee made all sort of stretch jobs in the name of affordable luxury (and underseat briefcase storage solutions), including Rolls-Royce Silver Shadow, Silver Spirit and Silver Spur conversions priced in the $125,000–150,000 range for the less budget-conscious. However, those with only $29,900 in their pocket could still call Scott Sampson at 414-273-2225 to order their very own custom-built Oldsmobile Delta 88 Limousine instead.
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Looks like they also used the coupe doors' glass too, instead of making something custom for it. I like that "uncustomized 53" rear doors" is touted as a feature.