I know what you mean about the frame, I left the front upright off till I got the FB in with the inlet already attached, but I'm pretty sure I mentioned leaving out the right pieces of the frame(don't think I specifically said that piece though, doh! My bad )
Don't stress over it too much dude, it's only metal. Even if you have to cut the upright out to get the FB in, you can always weld it back into place & it will be just as strong. You can even fill the biggest gaps by stitch welding it, it'll be good as new.
Alternatively as I did with the DP you can weld a short pipe coupler to the FB and then merely screw the pipe nipple into it, tack weld it so it does not unscrew and you are done and dusted.
Learning generally boils down to "Repetition or the avoidance of pain", some people learn by doing, some by watching and some just have to pee on the electric fence.
Whether you think that you can, or that you can't, you are usually right. Henry Ford
Sometimes a break in-between is a good thing. You can look at the sequence of build and make sure you are doing OK and head off potential issues before they happen.
And like the old adage states: Good things take time.
Learning generally boils down to "Repetition or the avoidance of pain", some people learn by doing, some by watching and some just have to pee on the electric fence.
Whether you think that you can, or that you can't, you are usually right. Henry Ford