Just use a 1mm blade and dont cut deep . if theres bits you cant do vertically , cut a few slots horizontally then cross them at 45 degrees , that will give you fingers that you can peel like a banana by grabbing them with a pair of vise grips ..
post a wider pic if poss and there may be other ways ,, depending on what tools you have to hand of course.
I've used a spot weld bit for the spot welds, fantastic bit of kit flew through them with ease.as above, also a spot weld drill could be usefull