I did this switch last year, My solutions to your questions are....
I was wondering what is the score with the pedal box and servo do i have to change them ?
I did dumped the servo and sierra pedal box, replaced with GBS pedal box, used a Ford Ka master cylinder, not using a servo.
and what do i do with the strengthening bar under the engine bay
I cut and shut it basically to protect the oil filter and sump I will have a skid plate attached soon; after I saw the filter from a friends car after grounding out. I cut the u bend off, extended the side tubes and put a cross tube to join them back together in front of the oil filter
also is there any other problems that i will bump in to ?
There will be some but there are a few of us that have done the switch so just ask.