Killick you'll get a lot of opionions on this.
I inherited the solar setup on Dulcamara from the previous owner. It's simple, and it's out of the way, I just don't like the aesthetics personally. It's a simple 4 x 4 ripped into two 2x4 which are clamped over the pushpit rails, with an aluminiun angle frame bolted to the top and the solar panels on that. When I get the time, or the money, I'll add a targa type set up to the pushpit and mount the panels on top.
I've built the seat you speak of too, which is a fantastic addition for either lazing around, or sitting on when someone else is on the tiller, or you're on auto. Mine is of teak decking and to preserve the finish, I've had a cover made.
Here's a distance shot.
And one that kind of shows how the seat fits, with the new covers.
Hope this gives you some ideas of what to do, or not to do as the case may be.
Michael