I think the best all around advice to pay heed to is do not glue the weights in such a way that they will be a pain to alter or adjust in the future.
Too bad so many folks are sold on the ARF trainer route as their only option to participate in this hobby. It's like deciding to learn how to make cheese, then choosing to make Cheezewhiz for your first batch.
The power of "marketeering" sure can not be denied when you see all the guys streaming out of the hobby shops with ARF trainers tucked under their arms, then later see all the burn barrels filled with ARF trainers awaiting their Viking Funerals.