Welcome Paul and congrats on chosing the STi option. Sounds like you have plenty of shop space for a comfortable build. Handy tools to have are the kind usually found in a shop. Drill press, vice, belt sander, cordless drill, air compressor etc. Most specialty items are of course available from Kitfox Aircraft
like reamers, clecoe pliers. A pop rivet squeezer is needed. A nice assortment of drill bits especially size 30 and 40. Extra long drill bits in size 30 and 40 are handy. A right angle drill is handy also. I’m sure others will mention things that make building easier. You might do a search for more ideas and check out the sticky posts on building tips in the forums.
Maybe have Kitfox Aircraft send your build manual early so you can start studying.