Search for "building panel modular foam" casts a wide net. Here are some of the results. An Australian firm offers panels for structural concrete applications, Unibuild, with US application. The National Park Service uses modular construction for collection storage inside historic buildings or in separate outside structures and offers many pointers in this Conserve-O-Gram. Sustainable Building Sourcebook provides an overview of structural wall panels and green considerations such as molded expanded polystyrene (MEPS) are "acceptable insulation or an alternative that has no ozone-depleting chemicals must be used. Additionally, waferboard, OSB [oriented strand board], sheetrock and/or siding need to be used as facings....COST: $1.75 to $2.75 per square foot or higher (material only). This can be slightly higher than conventional framing costs." Vesta Builders, Inc., a residential contractor serving a specific local area provides solid guidelines for details and allowances. Structall is a typical panel manufacturer of a patented insulated panel. None of these systems lend themselves to curved walls, so try a different search.