2。概念设计： 总结出最佳的几个方案，画出草图。 PRELIMINARY IDEAS PRELIMINARY IDEAS HANGER ROD人 BRACKETI IDEA BOLT TO WEB 9 OFFSET SUPPORT 9IN RIB IDEA 3 LOOKS HEAVY HANGER COLLAR BY OTHERS BOSS USE 2 BOLTS FABRICATE USING BENT BOLTLATLTOP SHEET AND BOTTOM IDEA2 IDEA 4 METAL TIME PRELIMINARY NAvE 5 PRELIMINARY NAME TIME IDEAS NO. SECT DATE IDEAS NO. SECT DATE 6总结出最佳的几个方案，画出草图。 2。概念设计：