CT20b Screamer Pipe

m currently looking at upgrading the stock downpipe on my gen 3 3sgte.
 
Long story short, I have a spare screamer pipe and am considering adding an external wastegate and screamer pipe to the stock ct20b and manifold.
 
https://imoc.co.uk/forums/viewtopic.php?t=104405&sid=5d88d89d16863abea180ffa31ddcb962
 
Has anyone done this and if so what would be the best way about going about it?
 
Anyone welded an external wastegate to the stock gen 3 manifold?
 
Also wondering if it would be necessary to weld the wastegate closed or if simply disconnecting it would work.
 
Anyone used a divorced downpipe?
 
Not too handy with a welder so looking at what options I have before deciding which down pipe and/or other relevant parts to purchase.