i would wich for a tower with higher temperarture output so one can use this tower also on crucible to use the klin wihtout support which requires 600C min.
I would suggest 700C to have some space; probablby with an option available.

Or other way round a 2Tier tower with higher spec which uses some items from heat related planets (vulcanus : tungsten, maybe even some carbonfiber from gleba)
The investment for a 2Tier could be considerably like also expensiver, naturally the 2Tier tower should require more mirrors though

would be a nice addition has a nice look and feel