If you enter the space platform hub, you won't be able to place the solar panels since the technology is not unlocked yet.
This is a very nice mod but I think it needs a bit of love and care.
Also a nice addition would be to have the inventory of the hub show up when you place stuff instead of ghosting because you need to remember what you have.

Fixed the bug about entering the space platform hub.
Solar panels you can definitely place, you just have to get the ghost cursor from the inventory rather than from the "ghost cursor" menu. But yes the interface is not optimal. Completely overriding the ghost cursor menu would probably also not be great though.