Not slow at all,,, we think about what we know. If you don't work with metal you wouldn't consider it an option is all.
Maybe have to include legs in the front to support the height change but it looks like standard steel used in the construction. Not wrought iron but round bar carbon steel. (imo) I'd stretch the thing so you have room to move.
The Fraternity of Dirt
If at first you don't succeed,,, keep kicking it
2-75g planted, 5-55g planted, 5-20g planted, 110g w/30g sump, 8-10g,
2012 update adding table top pleco pans & a 90g (Nutz)