Here is what I have used in the past.. this one is made for a 1.5 Meter Glider (60").. The original was from RCM plans and was designed for 2 meter gliders.. the Gentle Lady was one of the profiles used in the original article from 20 plus years ago.. I think the Riser and Wanderer were the other two.. I have the copies some where.. I'll look for them if you want.. The 049 sized one has balsa blocking behind the engine to support the engine mount.. an 049 will haul the glider up fine.. the TD 020 was a bit more power than I needed on my HLG a design from Model Builder called the Tossett.. man, it would thermal.. The Gentle Lady is a fine "floater.. I love that plane.
I see RCM had this article .. Gentle Lady Power Pod - 12/85 (102) I believe this is the one I have copies of.. I just saw it recently.. so I know I can find it.. all ply and mine was built over 20 years ago and is still in great condition..
I used a Cox QRC .049 .. a TD will haul it up there right now... The Black Widow .049 is perfect... and the Golden Bee if a great choice. I highly recommend Cox Fuel in their engines..

here is one from Tower Hobbies

Here is an article and comments on a Gentle Lady with electric powerpod
http://www.rcgroups.com/forums/showthread.php?t=332082
This one is on ebay
http://cgi.ebay.com/cox-new-in-package-POWER-POD-CAT-105_W0QQitemZ260415434098QQcmdZViewItemQQptZRadio_Control_Parts_Accessories?hash=item3ca1f82d72&_trksid=p3286.c0.m14&_trkparms=65%3A10%7C66%3A2%7C39%3A1%7C240%3A1318%7C301%3A0%7C293%3A1%7C294%3A50#ebayphotohosting
Back in the early 80s there was an all plastic one like this made for TD .049-.051 it will haul a 100" glider up there .. and you could use a one oz tank..


Here is the PDF on the Gentle Lady and show a power pod installation about 2/3 down the page.
manuals.hobbico.com/gbg/gbga0060-manual.pdf

And here is the Sig Power Pod

Jim