Mine gets wet when launching and the jack would last a year or two until I figured out
what part was filling up with water and drilled two 1/8" drain holes on the lowest section.
In our small unincorporated town just about anything could be facilitated at the county for a minimum of $750.
Unfortunately when that guy passed away, there was nobody to fill his shoes.
Don't know how good your sewing skills are,
but mine are not good so I would pay a pro to do the work.
Otherwise I would cringe everytime I saw a cover that I had made.
I tried towing with the cover on when we purchased our boat new.
After it flying off for the third time I gave up on that.
If your old cover stayed on and you want to repair it youself you will need an industrial sewing machine.
Otherwise do as previously mentioned and find a good canvas shop...