Salisbury Cathedral

[JackFlash]

Dims
Length=135
width nave=24
width transepts (including nave, so 62-24/2=12 each, for a total of)=62
height nave+transepts=26
spire height=69
so highest height=94

Possible doubling may be in order, in which case

Length=270
Width Nave=48
Width Transepts=24 by itself, inclusive=124
Height for Nave+Transepts=26
Spire Height=138
On top of build, spire=164

Doubling may not be possible if you wish to maintain proper scale of tower height.
Max buildable height range on the map (bedrock to above clouds) is 128.