How I can make a robust 2 'area for a work of art?

I need to create or buy an area of approximately 2 "in diameter. You must be strong enough to support plaster casts or foam filled molded human arms attached to the surface as if radiating from the origin. So optimal, the arms must be well enough attached to the sphere of support from the ground. I am open to any idea of what the material of the sphere, arms, or how to connect the two.

Use a large beach ball (they come in sizes up to 5 feet), place it in a plastic garbage bag, then covered with foil, tape if necessary. place on a round waste paper basket / bin, painting or palette with fiberglass resin and covered with cloth fiberglass; cure, inverted repeat. Build as many layers as you think you need to keep strong. You should sand between coats. Follow all precautions when working with fiberglass resin. Once cured, be able to drill and bolt fittings. You could do paper mache, if your attachments are similar. That would much easier, cheaper and less toxic. It would be like a giant piñata. See video links below:

BioShock – Breaking The Mold Concept Art

Wilton Wonder Mold Kit $15.00 WILTON-Classic Wonder Mold Kit. Create elegant 3-D doll cakes with the help of this kit. This package contains one 5-1/2×8-3/4in aluminum cake pan with stand and heat conducting rod for even baking; a 7in teen doll pick and complete baking and decorating instructions. Imported….

Wilton Silicone Mini Leaf and Pumpkin Mold $7.53 Pumpkin & Leaves Silicone Mold. Whether it’s cupcakes, brownies, jello or one of many other snack-time favorites this mold is a great tool to have. Because it’s made out of silicone it light-weight yet it can go almost anywhere a metal pan can go: Oven (up to 500 degrees), dishwasher, freezer, refrigerator and even the microwave. It resists stains and odors and it’s flexibility makes it easy and c…

Castin’ Craft Mold Release & Conditioner – 4 Ounce Spray $7.25 Mold release for Castin’ Craft Line. This mold release also cleans and conditions molds to extend their life. Odorless and solvent free….

Thar They Blow $13.99 …

Exploring Art Clay Silver, Part 1 [VHS] Art Clay Silver is a moldable clay that becomes pure (99.9%) silver when fired. In its wet stage, you can shape it into any form imaginable by rolling, sculpting, molding, stamping or extruding! After drying, you can sand, file, engrave and even drill your pieces! Firing is easy using an electric kiln, a butane torch, or even a gas stovetop! Art Clay Silver is versatile – it can be added to a vari…

Mold Making and Cold Casting [VHS] $34.99 The instructional sculpture video, “Mold Making and Cold Casting”, demonstrates the detailed processes of creating a clay model or pattern, two flexible molds including the mothermold, and two different final cast abstract sculptures. The artist and college art educator, Michael G. Booth, teaches how to make resin poured (cold casted) sculptures from start to finish including the entire mold makin…

Silikomart Frieze Semifreddi Relief Mat, 2 Inch $117.13 Eric Del Castillo Roberto Canedo Maria Cardenal…

Dragonfly Spring Garden Hand Painted Porcelain Lithophane Night Light Art Home Decor Dragonflies Nightlight $39.95 Lithophanes were concived in 1827, when it was discovered that a remarkable three dimensional image could be produced by shining light through a carving of varied thickness in porcelain. These beautiful transparencies are achieved by first carving the image into beeswax. The translucency of the wax allows the artist to see the results of his labor while he works. A plaster casting is taken from th…

Mastering Mold Making Part-2 Two-Part and Complex Molds $29.95 Michael Kryger’s Mastering DVD Series Part 2- Making 2-Part & Complex MoldsMaster mold maker and internationally renown artist Michael Kryger takes beginning mold making step-by-step to show how to create molds and beautiful castings for fun or profit. This 60 minute DVD is an introduction to: Advanced Silicone Molds Advanced Resin Casting Two Part Molds Injection Casting Demolding and Finish…

Mastering Mold Making – Part 3 $25.07 Michael Krygers Mastering DVD Series Part 3- Making Monumental Molds & CastingsIndustry pros Richard Bechtel and David Wolfe teach you how to create a mold and a fiberglass casting of a twice life size clay sculpture. Master mold maker Michael Kryger narrates this advanced mold making and casting video. Contents in this 40 minute DVD include: Building the Parting Line Creating Key Ways Applying …