A lot depends on the rules of your particular area. I will explain how things work in my local meta, as well as my personal feelings on the topic.
Your mileage may vary.
In friendly games, people around here really don't care whether use converted models, in fact many are quite good ( bad ones, of course, may be subject to ridicule.)
In tournaments, my local store even allows the use of third party models.
At the very least, as long as what you are converting was
GW to begin with, and you are not clearly modeling for advantage, there should not be a problem.
Just be aware that some people feel very differently about this.
As for me, the rule of cool always applies.

Your ideas definitely seem to meet that criteria.