I hope they have started working on the chassis so when the engines do get built they can just be dropped in and crash tests and road tests can begin this Spring.
MK
It appears that EM has a very good road map of what they need to do at what time and I am sure they have a pretty good idea of when the engine testing will be at the point that they will have additional engines in hand. It is very likely they will plan the test chassis builds to be ready at that date whenever it may be but it does look like they are targeting having these vehicles on the road in the spring.