Modbus Extensions

I was wondering if anybody had done a Modbus Extension for Scapy?  I am
currently working on one and was just looking to see if someone else had any
start to one.  I was also wondering if there is an easy way to resize a field. 
I receive a packet from a server copy it and change a couple fields around and
only two fields go from two bytes long to only a size byte and I did not know if
there is a way to change the size of the fields without using the variable
length field.  I tried to add just a different class and build the packet that
way but when I did that I always ended up getting an Ethernet trailer and the
packet was all messed up.

Thanks in advance,

Dustin

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