it wont be that hard, it just wont be moving at all
You wont have to worry about a corrector plate because of the cassigrain style.
look up on you tube there was a gent who made a 30" relay cassigrain its a 7 part presentation but well worth the hour and a bit. It will give you a big idea on what is required and the amount of effort needed to undergo this type of construction as he made the whole shabam from telescope to mount to observatory!