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Maybe this one....? G.

...... Suggest to read: Stress concentration - Wikipedia, the free encyclopedia and related external links G.

I know...., welding up that groove is kind of "tempting" but your weak spot so to speak won't be the weld seam in itself but the area adjacent to it. More or less you create an abrupt change of section width exactly where most of the stress & fatigue of the center disk would be expected. On some...

:-o Hmmmm ..... I think one should NOT weld them on the inside (backside) in this case .... to retain at least some flexibility and reduce residual tensions, IMHO. Also the one seam on the outside surely does cover the full thickness of the center disk if done right. Are you using MIG? Looks...

Sorry if this all created some confusion.... it is that sometimes we were comparing distance between hub mounting surfaces i.e. after flipping rear hubs...., then we speak about track width which is the distance between wheel/tire centerlines (like in my last diagram) See dimensions below and...

They can be worse than that regarding both, lateral and radially...! Now, getting them true within 3/32" is not an easy task but you should be able to reduce at least the wobble of your new creations to almost cero. BTW, ....you did check that your testing hub turns perfectly true, didn't you...

9.6" and 8º, respectively. Scrub radius in your case should be around 2 3/4" G.

I was curious about the final relative position, front wheels to fenders and rears to bed... after welding the center to the outer edge of the rim, backspace would be reduced from original 10.5" down to 6". Not that bad... G.