Your bike isn't a Pro Motion for the following reasons:
Pro Motion frames were made in the US and the serial numbers are stamped on the outside of the right rear dropout.
Pro Motion serial numbers begin with PM###
Yours is a non-US made frame with the serial on the bottom bracket and as a consequence is heavier by build.
Yours has CW stamped on the gusset again indicative of a non-US frame set.
The front forks have holes drilled in the dropouts, only seen on Z-2000.
This isn't a Z-2000 frame as the rear dropouts on a Z-2000 have a different shape to the standard CW rear dropout and have holes in them.
The colour way is not standard for the year yours was produced, paint and decals can be found at various outlets.
As CW went commercial in the mid-late 80s lots of models were produced and although serial numbers can only be used as a guide it's not a bad guide. They did mix and match at times to get bikes in the shops so having the fork/frame mix you have isn't impossible. The advert for the Z-1500 even stated that they were using the non-US Pro Motion frame for that model. (This is what I think you have) The forks are not standard CW forks and the frame is mid-late 80s. The colour whilst not factory is cool, I know, this is one of my Cruisers:
Here is my Pro Motion for reference, note the holeless forks and no stamp on gusset.
