Got mine in white plastic. A few little problems. The locking mechanism and the clip both seem very thin and flimsy. Also, it took a little work to separate the two halves of the locking mechanism and to clear out the back end of the barrel. (It was full of un-fused plastic dust - not at all your fault.)
That said, once it's together it feels nice and seems to work pretty well. It does seem to want to come apart a hair at the break, both otherwise is pretty good. I just am not super confident it will last through more than one refill.
Thanks for the design! It's really nice to see some pens on here that are not made for Bic refills.