CREATE TABLE table_203_873 (id DECIMAL, "model name" TEXT, "length" TEXT, "width" TEXT, "height" TEXT, "riders" DECIMAL, "capacity" DECIMAL, "description" TEXT, "portable" TEXT, "notes" DECIMAL)

total number of models created .
SELECT COUNT(DISTINCT "model name") FROM table_203_873
SELECT COUNT(DISTINCT "model name") FROM "table_203_873"