If it was me doing it , I'd use an arc air torch to burn the welds out of there , you can do some amazing things with an arc air , clean , precise , beautiful , in the hands of a competant operator .
Mocking it up to verify all angles before final welding makes a whole lotta sense to me too , yup , I'm kinda picky about how crap gets done , prefering the , do it once , do it right and forgetaboutit approach .