I love working with good quality resin. The variety of unique vehicles and otherwise unavailable parts is inspiring if you are tired of the same old offerings. You should sometimes expect the usual problems(?) like pin holes,excess flash and thicker body panels found with the injection molded kits we are used to.
I recommend a vigorous parts cleaning during the prep stage and I personally prefer using super glue as my adhesive of choice. Others prefer epoxy. I always use automotive speed glaze lacquer putty for fine body work and rattle can automotive primer.
Enjoy whatever you decide to do with your with your resin,but surely don't be afraid to dive right in and build them. Hopefully they are something unique that someone will see finished and ask you where you got that.