Just a little insight from the NEC Standpoint:
314.16 (c) 2011 NEC
(2) With Splices, Taps, or Devices. Only those conduit
bodies that are durably and legibly marked by the manufacturer
with their volume shall be permitted to contain
splices, taps, or devices. The maximum number of conductors
shall be calculated in accordance with 314.16(B). Conduit
bodies shall be supported in a rigid and secure manner.
IMHO, splicing within an LB, LL, LR, C, T, etc. is not a respected trade practice, and not often seen.
