Old Skool VW EV conversions

I'm beginning planning for upgrade of my recently purchased EV Karma - 1971 Karmann Ghia and poured through the EV Album to look for similar cars. Fortunately there are lots of them that have been done already. It seems from the data below that simply adding a couple batteries to my existing pack would give more range/speed and make the car more livable. However the last thing I want to do is become expert on the care and feeding of flooded lead acid batteries. That is so 1800's (almost literally).

1974 Volkswagen Beetle http://evalbum.com/3198
D&D Motor Systems, Inc. es31-b Series Wound DC / Curtis 1231c / 96 volts flooded lead-acid
60 miles/hr - 30 miles range

1967 Volkswagen Beetle http://evalbum.com/3186
D&D Motor Systems, Inc. ES-15A-6 Series Wound DC / Alltrax 7245 72V, 450 Amp / 72 volts flooded lead-acid
45 miles/hr, 25 miles range (estimated)

1966 Volkswagen Beetle http://evalbum.com/3145
Netgain Warp 9 Series Wound DC / Cafe Electric Zilla 1K LV / 128 volt LiFePO4, 160 AH
75 miles/hr, 60 miles range (estimated)

1975 Volkswagen Beetle http://evalbum.com/2955
D&D Motor Systems, Inc. es67a Series Wound DC / Curtis 1221C / Fullriver 115-12, 12.00 Volt, Lead-Acid, AGM
65 miles/hr, 40 miles range

1970 Volkswagen Beetle http://evalbum.com/2616
D&D Motor Systems, Inc. ES-15A Series Wound DC / Alltrax 7245 / 9 Energizer EGC8, 8.00 Volt, Lead-Acid, Flooded, 108 volts
52 miles/hr, 15 miles range

1977 Volkswagen Beetle http://evalbum.com/2593
D&D Motor Systems, Inc. ES31b Series Wound DC / Kelly KDH12600B / 8 Lifeline 31T, 12.00 Volt, Lead-Acid, AGM, 96 volts
55 miles/hr, 20 miles range

1972 Volkswagen Karmann Ghia http://evalbum.com/1890
Netgain Warp9 Series Wound DC / Logisystems 144V-156V, 1000amp / 12 Deka 8G31, 12.00 Volt, Lead-Acid, Gel, 144 volts
87 miles/hr, 33 miles range
233 wh/mile

1965 Volkswagen Karmann Ghia http://evalbum.com/1863
Advanced DC FB1-4001A Series Wound DC / Curtis 1231C-8601 / 12 Deka 31-Gel, 12.00 Volt, Lead-Acid, Gel, 144 volts
70 miles/hr, 40 miles range

1968 Volkswagen Karmann Ghia http://evalbum.com/1688
Advanced DC FB1-4001-A Series Wound DC / Curtis 1231C / 9 Trojan T-1275, 12.00 Volt, Lead-Acid, Flooded, 108 volts
75 miles/hr, 52 mile range

1964 Volkswagen Karmann Ghia http://evalbum.com/1412
General Electric 9 Series Wound DC / 16 Energizer GC2, 6.00 Volt, Lead-Acid, Flooded, 96 volts
80 miles/hr, 25 miles range

1969 Volkswagen Karmann http://evalbum.com/378
Prestolite MTC 4001 Series Wound DC / Curtis 1221C / 16, 6.00 Volt, Lead-Acid, Flooded, 210 AH, 96 volts
65 miles/hr, 50 miles range

1968 VW Karmann Ghia http://evalbum.com/267
Advanced DC FB1-4001 Series Wound DC 9" / Curtis 1209B / 15 US Battery US-2200, 6.00 Volt, Lead-Acid, Flooded, 90 volts
70 miles/hr, 50 miles range

1963 Type 34 Karmann Ghia http://evalbum.com/218
Advanced DC FB1-4001 Series Wound DC, 9" / Zapi HMF 400 / 24 US Battery US-145, 6.00 Volt, Lead-Acid, Flooded, 144 volts
80 miles/hr, 70 miles range