Thanks Jay @ssgt, these past two years I have built a few of these short run kits and they have all been like this one. Pretty much every single piece will need some amount of time to clean them up. Some are easy, some are hard and with some parts I will either replace them from a part from another kit or scratch build it. They will usually end up looking like a nice kit with the correct overall shape and looks and in some cases it will come close to the only kits that is made of the plane. That said as you can see this one took some work.
The other problem that I get from these builds are: no locator pins and adding the interior items I have to engineer on how to put things together. Pretty much like working on a vacu-form kit.
My current helicopter is the same, lots of cleaning, a little of scratch building and a lot of adjustments.
Still I like them and the final look to me is worth the fight.