This is just a proof-of-concept (POC) based on kitbashing bits of Bumblebee with Knockout (the mold used for Prime Smokescreen) in order to make him appear show accurate (indeed his show model is based on combining parts of Bumblebee with Knockout).
I suspect many kitbashers/customizers out there will be doing something similar once Smokescreen arrives on store shelves.
I used Arms Micron Knockout and removed his legs at the ball joints and removed the wheels from his shoulders (easily accomplished thanks to the way the wheels plug in instead of being pinned in
I then replaced his legs with those from an FE Bumblebee (PRiD Bumblebee's legs won't work due to the ball joints beind different sizes, FE Bee's legs fit without any modification).
I then removed the doors from PRiD Bumblebee which were held in by pins and fit them into the slots where Knockout's wheels would normally be on his shoulders, no glue or pins required and they're held in by friction. I'm sure that with the use of pins and such they could be given greater articulation and be more permanent but I was trying to do this without actually making any permanent changes to Knockout (those Bumblebees can burn though
The final touch was just removing the shoulder spikes from Knockout as I don't believe that Smokescreen has those, but they come off and re-attach easily anyway.
He obviously doesn't transform, but his bot mode is now more show accurate than the toy we'll be getting.