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If the Pug engine is a 90-100 degree V8, that shouldn't be a problem. Aside from mounting the oil tank on the front on the R10 and R15, the Audi LMP engines share a common design heritage with the Audi R8's V8--all had a 90 degree cylinder angle, uses similar mounting points and as Baretzky has admitted, share the same basic architecture.
Tub lenght doesn't determine wheelbase as much as the power train and suspension geometry--the Audi R15's V10 was about 4 inches shorter than the R10's V12, but the R15 has about a 3-4 inch longer wheelbase. Tub lenght was probably similar, and it's down to suspension geometry and the longer bellhousing on the R15's gearbox casing.
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