New recumbents are expensive, but used ones are very cheap. Afyer seeing several within an hour's drive of me for $300, I got a Rans Rocket for $100. Appparently it had been available (but poorly advertised) for two years.
A little while after I became "the guy who rides a recumbent", I was given a Rans Vivo for free, because the owner hhad determined that the expected sale price wasn't worth the time and effort to sell.
The cost wouldn't necessarily be in the bike, but in requirements for mandatory paid registration, licensing classes, insurance, inspection, and safety equipment.
Wattage is basically meaningless. There is nk standard way to measure it. Almost all "250 watt" ebikes consume much more than 250 watts of electricity at full throttle, and can produce much more than 250 watts of mechanical output for seconds or minutes at a time.
To rotate the view in SolveSpace, you need any one of these:
* a keyboard's shift key and a right mouse button, or
* a middle mouse button, or
* a 3D mouse.
I've done some work in SolveSpace with a Wacom tablet, by binding the stylus's buttons to the middle and right mouse buttons. SolveSpace is a pretty simple program, so you don't need to dig deep through the UI to get to all the functions. Lost of the often-used functions have keyboard shortcuts, but I don't think there is anything that is only accessible through the keyboard.
Depending on what you aim to do, you might be interested in keeping up with Blender's currently-in-development tablet mode:
SolveSpace does have some ability to control the color and fill of areas. It's nowhere near as powerful as Inkscape, but enough to make simple diagrams. The exported SVGs can also be edited in Inkscape.
Just because you type dimensions in doesn't mean it's parametric. If you're manually patching meshes, you're almost certainly not doing parametric CAD! (This does match with my memories of SketchUp, beck when it was owned by Google. I had to fix holes and overlapping geometry by editing the .STL files in Blender before any of the primitive slicer programs could process them.)
OnShape and Fusion360 are fully parametric CAD programs. Another free-tier closed-source one is Siemens Solid Edge (the "Hobbyist" edition). FLOSS parametric CAD programs that are reasonably usable are FreeCAD (complicated but powerful) and SolveSpace (an 80/20 sort of tool -- nowhere near as powerful, but vastly easier to use).
FreeCAD can do this. So can all of the proprietary parametric CAD programs I've ever used, some of which (PTC OnShape, Siemens Solid Edge, Autodesk Fusion) have usable free tiers available.
As someone who used the HTML gmail interface right up until google pulled the plug: the JS version is much slower to load. Every morning, I get to have about 10 seconds thinking about how it used to be faster.