second set of multiple side shield attachment flanges 9 a extends outwardly from the second base panel side wall 5 a in spaced apart relationship with respect to each other a second set of flange gaps 12 a separates the adjacent side shield attachment flanges 9 a from each other as illustrated in fig1 the side shield attachment flanges 9 of the first flange set may be offset or staggered with respect to the respective side shield attachment flanges 9 a of the second flange set likewise the flange gaps 12 of the first gap set may be offset or staggered with respect to the respective flange gaps 12 a of the second gap set a shield fastener opening 10 may extend through each side shield attachment flange 9 of the first flange set and each side shield attachment flange 9 a of the second flange set for purposes which will be hereinafter described a corrugated panel 16 is provided on the base panel 3 of the protective shield base 2 between the first and second base panel end walls 4 and 4 a respectively and between the first and second base panel side walls 5 and 5 a respectively the corrugated panel 16 may be steel for example and without limitation and has multiple panel ridges 17 and intervening panel troughs 18 as illustrated in fig1 the panel ridges 17 and panel troughs 18 of the corrugated panel 16 may extend transversely across the longitudinal axis of the base panel 3 in generally perpendicular relationship with respect to the first base panel side wall 5 and the second base panel side wall 5 a and in generally parallel relationship with respect to the.