I sure wish I could weld & fabricate. I have a lot of ideas but no means of putting them into metal.
Get a 100 Amp buzzbox and a MAPP gas torch to anneal the welds. I rebuilt a Willys Jeep with just that, including a lot of frame repairs. No cracks. An angle grinder is great for shaping bracketry and getting some really cool scars. You can probably land all you need for about $200.