OK, for 'rejected' read 'Engine Failure After T/O'. The 'one engine out' case is the same thing. And Cat II ILS, OK. Now to your original questions:
1. Following engine failure, continue as cleared. After a T/O this will be per SID or departure clearance, or following a go-round it will be as per standard Missed Approach Procedure or as modified by ATC. If the failure means you're unable to comply, tell ATC, declare emergency if necessary, and get a new clearance.
2. MAPt. - already answered.
3. DA(H) refers to Decision Alt or Decision Ht, depending on whether you are using QNH or QFE, as explained by Freddie-M. The Radalt reading is clearly marked 'RA'. TCH is a different thing. It is your height above the ground as you cross the Threshold, in your example 49 ft as you cross a displaced (i.e. inset) threshold. This has nothing to do with instrument minima. It is more for info. in case the back end of the aircraft is a long way below the front end.
Hope this clarifies things for you.