I don't think that's going to be useful on a 25' twin engine C-Dory as the twins are much farther apart on a Tomcat than on the CD-25. Here's a picture of the back of his boat.
Since I'm guessing the above image was taken with a GoPro (or similar) with a wide angle lense, I bet there's actually more room on the outside of the engines than it would appear in the photo.
Here's a ladder that Les at EQ installed on a CD-22 with twins.
A more complete discussion can be found in this thread.
I appreciate the information but would really like to be able to use one of the telescoping models with a small platform just don't think I have the real estate for it.
Take a look at page three of C-Cakes photo album. We have a small platform with a telescoping ladder on a 22 with twins. Given the extra width of a 25 this should work for you. Step installed by Les Lampman at EQ.