Welcome to the club!
Don't let not being able to weld stop you from building your own chassis. It's a fun part of the project, albeit somewhat dirty. You can teach yourself MIG welding by spending some time on
http://www.mig-welding.co.uk/ tutorials and forums, then practising for several hours on scraps, destructively testing your welds until they're good enough. Build a rack or a welder trolley and see how it goes. Building a chassis will completely solidify your skills, and by the time you're done you might feel confident enough about building your own wishbones.
Welding is a skill that will come out useful on many occasions: making an alternator bracket, getting out bolts that are stuck or have sheared off, making solid shelves for the garage, fixing garden gates...
P.S. I'm speaking from experience. I bought a welder a couple of weeks be fore starting the chassis.