C89, 345 characters
Newlines added for your sanity (they are not included in the character count and can/should be deleted):
char o[5][99];
d[]={0x2df7fbef,0x3927bb6b,0x396792cf,0x3da7dbed,0x3a4bfb27,0x2d76f249,0x2dbedbfd,0x3db793ef,0x3fb7daeb,0x3ce7a497,0x3db6ab6d,0x3ff6d495,0x3cf6f2a7,0x38ff8000};
c,i,j;
main(){memset(o,32,495);
while((c=getchar())>0){
for(j=0;j<15;j++)
o[j/3][i+j%3]=d[c-33?(c-65)/2:13]>>((c&1)*15+j)&1?c:32;i+=4;}
for(j=0;j<5;j++)printf("%.*s\n",i,o[j]);}
