This is something that I honestly hope will come one day in the future, but knowing the odds and how long it takes to make one car in Beam this might only happen to 2-3 cars at the most (unless the modding community steps in, but even so it would take a while). Some of the cars you suggested seem a bit off, but I'm not going to repeat what other people said (because for the most part I agree with what they said).
I'd say the H-Series would be more of an Transit/Transit Courier-like vehicle, since the E-Series was discontinued in 2014 and was replaced by the Transit. Also, the 2017 Impreza would be an more fitting version for an modern Sunburst, since the original had plenty of Impreza styling.
Although the Transit was also introduced in cutaway and chassis-cab configurations for North America as well, Ford has continued commercial production of the E-Series in cutaway cab and stripped chassis configuration; no planned date is set for the end of production. Okay, your right, but it's only currently either an stripped chassis or cutaway cab nowadays, instead of the previous passenger/cargo vans.
only thing that i don't like is the 2017 sunburst the sunburst is way more like a subaru impreza or wrx
The I-Series seems to be more of a 5-Series/W124-style car, judging by the fact that it offers a 3.0 engine.
First, I-series is classified as midsize in-game, not as fullsize. Second, here are some comparisons with real life cars: Midsize: ETK I-series- 4.7 (roughly) Audi 80- 4.404 BMW E30- 4.46 Mercedes W201- 4.448 VW Passat- 4.57 Ford Sierra- 4.609 Small Executive: Audi 100 EUDM- 4.793 Audi 100 USDM- 4.895 BMW E34- 4.72 As you can see, I-series is bigger than real midsize cars, but smaller than fullsize/small executive. I'd say it is a very large midsize with a powerful engine.
Because it's done along the US classification, which lists the W124, E34 and F30 as midsizers. In Europe, the earlier 2 are executives, and the F30 is midsize.