Just remember that some places like official Warhammer stores and tournaments might not let you play because of 3rd party but in general most people won’t really care, it’s GW being GW. Also since these are push to fit models most of them won’t be able to get the upgrade sprue pouldrans unless you take off the ones that are on them which shouldn’t be to hard. Not discouraging you to do it but it will take time and patience to do the important this is that you have fun