Beastman modelling questions

As I'm big modelling fun, while I'm getting to the end with my skavens, I'm thinking about starting modelling ne warband.
I've chose beastmen and I have a question:
- how big is Centigor model?
I want to do one myself using Gor and horse (from pistoliers box, or chaos mounted marauders) but I'm afraid, that he will be too big.

I build my centigor out of a plastic-gor and one of those old horses without barding and such:
http://www.games-workshop.com/gws/catalog/productDetail.jsp?catId=cat440121a&prodId=prod1290030
The horse was already rather big for the gor. The marauder horses are definitely WAY too big and so are, mostlikely, the pistoliers' horses as well.

Thanks Grimscull.

I have already 10 horses and it isn't good idea to buy another 5
and I'm not really big fan of metal GW Centigors... hmm...
I'll have to find another way...

I have seen a few plastic centigor conversions around...

I believe there was one in LOD (ah here it is, scroll down a bit)

http://tabletopgeeks.com/wp-content/downloads/supplements/LOD3.pdf

There are also a few on Herdstone, the Warhammer Fantasy Beastmen forum

http://z2.invisionfree.com/herdstone/index.php?act=ST&f=204&t=19777&view=getnewpost (tutorial about building centigors out of gors and marauder horsemen, on the second page there's also a picture of centigors made out of wood elf horses)

http://z2.invisionfree.com/herdstone/index.php?showtopic=18262 (Showcase of a lot of centigors-most are metal but there are a few plastic ones in there to give you ideas)