No, they don't need to go all the way back, but there has to be some cross brace or space so they can be welded.
That X-design is probably an overkill, but it would be effective. One thing you have to be sure you nailed the over width dimension as that design won't have any give to it. It would be strong.
One thing I would do with that design is nixed the X and have one brace running horizontal across tying both yokes together and then having it welded to the lift tab strengthening it...... it does give me ideas.
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