I know B&M made custom supports that Efteling insisted on for the lift on their Baron 1898 coaster, which looks awesome, but I highly doubt we'll ever see a B&M coaster at a Disney park, unfortunatelyShort answer is Vekoma allows Disney to design their own coasters and then Vekoma comes in to fabricate and produce. This is why the Disney designed Vekoma's tend to run smoother than Vekoma's older designs. Originally Disney had hired Arrow to build different rides including the Pirates boat and flume system and I most of the Disneyland coasters. Then after Arrow went bankrupt they turned to Vekoma who gave them similar control. I want to say that I read somewhere that Disney approached B&M at one point but they would not allow Disney creative control over the design process, but I may be mistaken.