Interesting question. I would suggest the biggest difficulty is the weld itself...that is, the fillet. I suppose if one properly 'sculpted' the lugs and block, the weld might not be be raised that much. If not, I would think filing/grinding back to right angles on the monoblock's weld would weaken the structure. I've seen some great TIG welds, maybe that process. I've watched every factory, video on Utube.....H & H, Heym, etc. I could find and I haven't seen a weld yet. Wouldn't you have to relieve the action sufficient to except the fillet? Guess you'd have to try it to find out. Anyway, one guys opinion. Remember Brown talked about trying to make a demiblock...I think....and said it was a disaster......no explanation followed. Bill