Options 1, 5 and 6 are for open steel structures.
Option 2 is a similar open structure with steel columns and wood framing and optional observation deck above.
Options 3 and 4 are steel or concrete columns and foundations with curved wood beam and plank roof, also fabric shade infill. Shade fabrics for sun cover could be completed right away until there are funds to do more. The solid roof and walls for interior space could come after, and a bathroom or 2 would be welcome.