While we usually recommend the use of our excellent HazMat Canisters for the transport of hazardous or toxic materials onboard regular, unmodified vessels, it seems that you want a ship dedicated to the transportation of these substances. In a nutshell, the conversion process will involve the encapsulation of the inner hull with our proprietary lead-iridum alloy, the application of extra radiation shielding between the cargo and crew compartments and the addition of advanced safety and monitoring systems required for the safe and proper transportation of hazardous materials.

In my professional opinion a 568-ARKG-B6 "Behemoth" class transport would be most suited to your needs. It has similar specifications to the Heron, having the same cargo space and slightly improved armour and firepower. Most importantly, it is the only ship which we use to haul toxic waste in bulk as part of our cleanup operations with the exception of the mighty Golem, which as I'm sure you know is almost completely off-limits to outside organisations. As a result our engineers are familiar with working with the Behemoth and so the conversion fee will be significantly lower. In fact, should you choose the Behemoth it is available for immediate purchase, fully kitted out for hazardous material transport, from Dortmund Station for 21,100,595 credits (see attachment below). However if you would still rather use the Heron, a ship (supplied by you) can be converted for 14,500,000 credits, resulting in a total cost of 35,600,595 credits at the current market rate for a ship of that class.

I trust you will find this information helpful and await your reply.