If points were taken off and you don't understand why, try here.

(general) prove why your reduction works (or don't complain that you get no explanation why it's wrong).

(1b) missing explanation of why the model has a finite number of TMs for some specific $\Sigma$ (or that we need to deal with a specific $\Sigma$.

(3c) making a serial rather than parallel computation.

(3d) making a serial rather than parallel computation; using a non-constant number of tapes.

(4a) picking languages not in $\mathcal{RE}\setminus\mathcal{R}$ or not proving they're in $\mathcal{RE}\setminus\mathcal{R}$.