Yeah, that extra width definitely carries over into the cost of the crate and shipping. Makes sense it'd be a little more. They said about a half day to install with 2 people, so figure 8 hours of labor, which will push yours to $5k, plus your round trip out of the water, which here would be another $1k.
The issue I have with their versions for the 80's boats is the relatively modern oval vents. The shape of the platform itself is great, as is the hidden ladder, but the ovals kill it for me with the look of these older 80's boats. Way too modern looking. The version for mine has 5 of them and they don't look right in context of the rest of the boat's design. I understand the front berth widows in the hull are oval, but they're a little more angular, as is the rest of the boat. Since the company has invested in a mold, they can't do different vent shapes, so I'm pretty on the fence about using their platform.
I asked a local yard what it would cost to fab a similar platform. I want similar width, but 42" or 46" long instead of 39" and potentially with several updated teak grates, maybe like this type of shower grate, to keep a bit of the original look to it. We'll see how unreasonable the estimate is, ha.
Oh, look, they actually have inserts for the original swim step:
