I guess your idea of a budget build and mine are different, as that certainly doesn't come off as very 'budget' to me. Those hardware choices are good and will be enough to get you into plenty of trouble.
The only recommendation is to forget the axle sleeve. It's not an effective strength-to-weight solution. Go for a truss instead like the Artec or similar.
A society that puts equality before freedom will get neither. A society that puts freedom before equality will get a high degree of both.