It would be very nice if we could see our archived towers/traps without having to remove one we’re using. Why can’t we just look at these archived like we can unused inventory armor and weapons? It helps to see what you have, what can be used, without the silly added step of moving and then replacing a tower.
Also, we should be able to sell back towers we don’t want any more. If I spent $6M upgrading a tower and don’t want it any more, it would make sense – just like with unused armor and weapons – to be able to sell it for 600000 gold, or 10% of what we spent to upgrade. If we can for swords, why not towers?