The idea for this has been rattling around for some time. The thought was to fabricate something simple from common parts. You may have to alter this to accommodate your stove.
(4) Sections of 1 inch x 1/8 angle iron
(4) 3/8 Coupling Nuts
(4) 3/8 x 2 1/2 Elevator Bolts.
While I buy my steel at a steel supplier, it is available at Home Depot or Loews. Just be prepared to pay double at the big box stores.
4 pieces of appropriate length 1 inch by 1/8 angle is used. The ends are cut at 45° angles and made 1/4 inch longer on the inside measurement, than the outside dimensions of your stove. Depending on your stove. you may have to add a middle support(s) using 1 x 1/8 strap.
My 4 pieces that create a rectangular frame are clamped to a welding table upside down. The bottom of the 45° seam is welded. The vertical corner seam is welded. (DO NOT WELD THE INSIDE OF THESE SEAMS)
When all four corners are complete grind your welds to your finished preference. Clamp the rectangular frame down to your welding table, top side up.
Weld your “coupling nuts” to the sides angle iron, flush with the front angle iron edge. End of nut should be flush with the welding table top (and the finished bottom of the leveler frame) Grind welds if needed.
Finish paint with high temp flat black.