Del,
In my experience you want everything to exactly match the paperwork as the police/inspectors are supposed to look for discrepancies. My MSO had RCR logos, RCR watermarks etc. Race Car Replicas was the signing authority so it manufactured the car, not Superlite. Superlite only appears twice as follows:
MAKE: SUPERLITE
MODEL: SUPERLITE COUPE; SL-C
I also believe its helpful to have the tag look official. I spent a fair amount of time looking at plates to try to make the layout look "right." IMO, that's blank boxes with stamped specifics. I was short on time before my LEO inspection, so I just had the letters printed. Given that I have a typo, I will need to redo it and the final version will have stamped specifics. IMO a purely laser-etched plate doesn't look like something that low-volume automotive manufacturer (or high-volume boat manufacturer, or trailer manufacturer, etc.) would do. Potential issues will vary widely based on the state and the person doing the inspection, so better to be safe than sorry.
Also note that many etching/stamping providers won't produce VIN plates because they don't want the liability or potential legal issues of doing so. Laws vary by state, so don't assume that if it's OK in your state it's OK everywhere.
IMO, you should consider the following; shrink the plate a little (3.5" seems a little big but I'm not near my car to measure), use RCR (or at least have an RCR option), and use blank boxes that allow the customer to take the plate to a local company to have the plate engraved/stamped.
It would be much easier if RCR did this like other component car manufactures do. Note that when I had my cobra inspected in MA everything matched, but the state trooper called the manufacturer to validate that location and style of the chassis number (a weld bead on the chassis) and the identification plate (a etched plate with stamped specifics) was in the correct location and of a correct appearance. Things might have gone very wrong if they heard "we don't do anything... the customer made it up." IMO, it would be great to have a standardized plate in a standardized location.