If you have a last target macro you can drop the goza mat you place the forge on. Place 16 square goza mats and raise up each goza mat two times each. Make sure they are all lined up properly. Place the forge, I think it goes on the back left corner goza mat. When you do this you have made that goza mat your last target. Double click your dec tool and hit down, then hit your last target macro. Do this one more time and you should see that back left corner of the forge drop. If it doesn't drop then do it one more time (down, last target). Sometimes when using the tool if you dont' wait long enough it won't raise an object because of the timer.
Anyways, once you see it drop, it's broken. Axe all the pieces you don't want, make sure to leave at least one of the anvil pieces. You may want to figure out ahead of time if the orientation is where you want it, though we're kind of limited as to what we can do:
XXXX
XXXO
XXXO
XOOX
The X's are the non essential parts of the forge, and the O's are the anvils.
BTW if this is a custom home you MUST lock down the pieces of anvil before you ever go into customize mode. If you dont' lock them down then they will poof when you try to customize, and goodbye relic. If you can't lock them down, don't customize unless you really have to or don't mind using another relic bit.